Explain better conversion from collection expression (dotnet#42995)

* Explain better conversion from collection expression

Fixes dotnet#42819

* fix warnings from C# standard update

We merged part of NRT into the C# standard repo. Fix the ripple effects of renumbering sections.

docs/csharp/language-reference/operators/arithmetic-operators.md

@@ -277,7 +277,7 @@ You can use the `checked` modifier only when you overload any of the following o
 
 For more information, see the following sections of the [C# language specification](~/_csharpstandard/standard/README.md):
 
-- [Postfix increment and decrement operators](~/_csharpstandard/standard/expressions.md#12815-postfix-increment-and-decrement-operators)
+- [Postfix increment and decrement operators](~/_csharpstandard/standard/expressions.md#12816-postfix-increment-and-decrement-operators)
 - [Prefix increment and decrement operators](~/_csharpstandard/standard/expressions.md#1296-prefix-increment-and-decrement-operators)
 - [Unary plus operator](~/_csharpstandard/standard/expressions.md#1292-unary-plus-operator)
 - [Unary minus operator](~/_csharpstandard/standard/expressions.md#1293-unary-minus-operator)
@@ -287,7 +287,7 @@ For more information, see the following sections of the [C# language specificati
 - [Addition operator](~/_csharpstandard/standard/expressions.md#12105-addition-operator)
 - [Subtraction operator](~/_csharpstandard/standard/expressions.md#12106-subtraction-operator)
 - [Compound assignment](~/_csharpstandard/standard/expressions.md#12214-compound-assignment)
-- [The checked and unchecked operators](~/_csharpstandard/standard/expressions.md#12819-the-checked-and-unchecked-operators)
+- [The checked and unchecked operators](~/_csharpstandard/standard/expressions.md#12820-the-checked-and-unchecked-operators)
 - [Numeric promotions](~/_csharpstandard/standard/expressions.md#1247-numeric-promotions)
 
 ## See also

docs/csharp/language-reference/operators/collection-expressions.md

@@ -53,6 +53,7 @@ The compiler uses static analysis to determine the most performant way to create
 
 Many APIs are overloaded with multiple collection types as parameters. Because a collection expression can be converted to many different expression types, these APIs might require casts on the collection expression to specify the correct conversion. The following conversion rules resolve some of the ambiguities:
 
+- A better element conversion is preferred over a better collection type conversion. In other words, the type of elements in the collection expression has more importance than the type of the collection. These rules are described in the feature spec for [better conversion from collection expression](~/_csharplang/proposals/csharp-13.0/collection-expressions-better-conversion.md).
 - Conversion to <xref:System.Span%601>, <xref:System.ReadOnlySpan%601>, or another [`ref struct`](../builtin-types/ref-struct.md) type is better than a conversion to a non-ref struct type.
 - Conversion to a noninterface type is better than a conversion to an interface type.
 

docs/csharp/language-reference/operators/default.md

@@ -37,7 +37,7 @@ The following example shows the usage of the `default` literal:
 
 ## C# language specification
 
-For more information, see the [Default value expressions](~/_csharpstandard/standard/expressions.md#12820-default-value-expressions) section of the [C# language specification](~/_csharpstandard/standard/README.md).
+For more information, see the [Default value expressions](~/_csharpstandard/standard/expressions.md#12821-default-value-expressions) section of the [C# language specification](~/_csharpstandard/standard/README.md).
 
 ## See also
 

docs/csharp/language-reference/operators/member-access-operators.md

@@ -250,9 +250,9 @@ The `.`, `()`, `^`, and `..` operators can't be overloaded. The `[]` operator is
 For more information, see the following sections of the [C# language specification](~/_csharpstandard/standard/README.md):
 
 - [Member access](~/_csharpstandard/standard/expressions.md#1287-member-access)
-- [Element access](~/_csharpstandard/standard/expressions.md#12811-element-access)
+- [Element access](~/_csharpstandard/standard/expressions.md#12812-element-access)
 - [Null-conditional member access](~/_csharpstandard/standard/expressions.md#1288-null-conditional-member-access)
-- [Invocation expressions](~/_csharpstandard/standard/expressions.md#1289-invocation-expressions)
+- [Invocation expressions](~/_csharpstandard/standard/expressions.md#12810-invocation-expressions)
 
 For more information about indices and ranges, see the [feature proposal note](~/_csharplang/proposals/csharp-8.0/ranges.md).
 

docs/csharp/language-reference/operators/nameof.md

@@ -32,7 +32,7 @@ When the operand is a [verbatim identifier](../tokens/verbatim.md), the `@` char
 
 ## C# language specification
 
-For more information, see the [Nameof expressions](~/_csharpstandard/standard/expressions.md#12822-the-nameof-operator) section of the [C# language specification](~/_csharpstandard/standard/README.md), and the [C# 11 - Extended `nameof` scope](~/_csharplang/proposals/csharp-11.0/extended-nameof-scope.md) feature specification.
+For more information, see the [Nameof expressions](~/_csharpstandard/standard/expressions.md#12823-the-nameof-operator) section of the [C# language specification](~/_csharpstandard/standard/README.md), and the [C# 11 - Extended `nameof` scope](~/_csharplang/proposals/csharp-11.0/extended-nameof-scope.md) feature specification.
 
 ## See also
 

docs/csharp/language-reference/operators/new-operator.md

@@ -62,7 +62,7 @@ A user-defined type can't overload the `new` operator.
 
 ## C# language specification
 
-For more information, see [The new operator](~/_csharpstandard/standard/expressions.md#12816-the-new-operator) section of the [C# language specification](~/_csharpstandard/standard/README.md).
+For more information, see [The new operator](~/_csharpstandard/standard/expressions.md#12817-the-new-operator) section of the [C# language specification](~/_csharpstandard/standard/README.md).
 
 For more information about a target-typed `new` expression, see the [feature proposal note](~/_csharplang/proposals/csharp-9.0/target-typed-new.md).
 

docs/csharp/language-reference/operators/type-testing-and-cast.md

@@ -148,7 +148,7 @@ For more information, see the following sections of the [C# language specificati
 - [The is operator](~/_csharpstandard/standard/expressions.md#121212-the-is-operator)
 - [The as operator](~/_csharpstandard/standard/expressions.md#121213-the-as-operator)
 - [Cast expressions](~/_csharpstandard/standard/expressions.md#1297-cast-expressions)
-- [The typeof operator](~/_csharpstandard/standard/expressions.md#12817-the-typeof-operator)
+- [The typeof operator](~/_csharpstandard/standard/expressions.md#12818-the-typeof-operator)
 
 ## See also
 

docs/csharp/language-reference/statements/checked-and-unchecked.md

@@ -55,7 +55,7 @@ Constant expressions are evaluated by default in a checked context and a compile
 For more information, see the following sections of the [C# language specification](~/_csharpstandard/standard/README.md):
 
 - [The checked and unchecked statements](~/_csharpstandard/standard/statements.md#1312-the-checked-and-unchecked-statements)
-- [The checked and unchecked operators](~/_csharpstandard/standard/expressions.md#12819-the-checked-and-unchecked-operators)
+- [The checked and unchecked operators](~/_csharpstandard/standard/expressions.md#12820-the-checked-and-unchecked-operators)
 - [User-defined checked and unchecked operators - C# 11](~/_csharplang/proposals/csharp-11.0/checked-user-defined-operators.md)
 
 ## See also