Add [head, ..tail] patter to List patterns page

src/content/chapter2_flow_control/lesson04_list_patterns/code.gleam

@@ -10,6 +10,7 @@ pub fn main() {
     [] -> "Empty list"
     [1] -> "List of just 1"
     [4, ..] -> "List starting with 4"
+    [3, ..rest] -> "Starts with a 3, captures the rest"
     [_, _] -> "List of 2 elements"
     _ -> "Some other list"
   }

src/content/chapter2_flow_control/lesson04_list_patterns/en.html

@@ -11,5 +11,8 @@
   The spread pattern <code>..</code> can be used to match the rest of the list.
   The pattern <code>[1, ..]</code> matches any list that starts with
   <code>1</code>. The pattern <code>[_, _, ..]</code> matches any list that has
-  at least two elements.
+  at least two elements. By adding a variable name after the <code>..</code>, you
+  can capture the remaining elements of the list. The pattern <code>[_, ..rest]</code>
+  will match a list with at least one element and assign the rest of the elements
+  to the variable <code>rest</code>.
 </p>

src/content/chapter2_flow_control/lesson07_list_recursion/en.html

@@ -2,16 +2,14 @@
   While it is more common to use functions in the
   <a href="https://hexdocs.pm/gleam_stdlib/gleam/list.html" target="_blank">
     <code>gleam/list</code>
-  </a> 
+  </a>
   module to iterate across a list, at times you may prefer to work
   with the list directly.
 </p>
 <p>
-  The <code>[first, ..rest]</code> pattern matches on a list with at least one
-  element, assigning the first element to the variable <code>first</code> and
-  the rest of the list to the variable <code>rest</code>. By using this pattern
-  and a pattern for the empty list <code>[]</code> a function can run code on
-  each element of a list until the end is reached.
+  By using the <code>[first, ..rest]</code> pattern and a pattern for the empty
+  list <code>[]</code> a function can run code on each element of a list until
+  the end is reached.
 </p>
 <p>
   This code sums a list by recursing over the list and adding each int to a