Clarify acceptable package name

doc/new_command.md

@@ -10,16 +10,16 @@ stack new PACKAGE_NAME [--bare] [TEMPLATE_NAME] [-p|--param KEY:VALUE] [DIR(S)]
 `stack new` creates a new Stack project for a package using a project template.
 
 A package name acceptable to Cabal comprises an alphanumeric 'word'; or two or
-more such words, with the words separated by a dash character (`-`). A word
-cannot be comprised only of the characters `0` to `9`. An alphanumerical
-character is one in one of the Unicode categories Lu (Letter, uppercase),
-Ll (Letter, lowercase), Lt (Letter, titlecase), Lm (Letter, modifier),
-Lo (Letter, other), Nd (Number, decimal digit), Nl (Number, letter), and
-No (Number, other).
+more such words, with the words separated by a hyphen/minus character (`-`). A
+word cannot be comprised only of the characters `0` to `9`.
+
+An alphanumeric character is one in one of the Unicode Letter categories
+(Lu (uppercase), Ll (lowercase), Lt (titlecase), Lm (modifier), or Lo (other))
+or Number categories (Nd (decimal), Nl (letter), or No (other)).
 
 !!! note
 
-    In the case of Hackage and acceptable package names, an alphanumerical
+    In the case of Hackage and acceptable package names, an alphanumeric
     character is limited to one of `A` to `Z`, `a` to `z`, and `0` to `9`.
 
 The project is created in a new directory named after the package, unless the