* hash.c: [DOC] Improve description of symbol key syntax

Patch by Raphael Das Gupta in documenting-ruby/ruby#51:
  https://github.com/documenting-ruby/ruby/pull/51


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51506 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Sat Aug  8 03:39:33 2015  Zachary Scott  <zzak@ruby-lang.org>
+
+        * hash.c: [DOC] Improve description of symbol key syntax
+          Patch by Raphael Das Gupta in documenting-ruby/ruby#51:
+          https://github.com/documenting-ruby/ruby/pull/51
+
 Fri Aug  7 21:04:19 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (parser_params): turn in_def and in_single into bit

hash.c

@@ -3909,7 +3909,7 @@ env_update(VALUE env, VALUE hash)
  *
  *    grades = { "Jane Doe" => 10, "Jim Doe" => 6 }
  *
- *  Hashes allow an alternate syntax form when your keys are always symbols.
+ *  Hashes allow an alternate syntax for keys that are symbols.
  *  Instead of
  *
  *    options = { :font_size => 10, :font_family => "Arial" }