Fix typo in racc english documentation [ci skip]

* lib/racc/rdoc/grammar.en.rdoc: [DOC] fix typo, "convertion" to
  "conversion".  [Fix GH-1016]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51854 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Mon Sep 14 11:12:10 2015  Anton Davydov  <antondavydov.o@gmail.com>
+
+	* lib/racc/rdoc/grammar.en.rdoc: [DOC] fix typo, "convertion" to
+	  "conversion".  [Fix GH-1016]
+
 Sun Sep 13 11:03:13 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* include/ruby/ruby.h: prefix RUBY or RB to global symbols to get

lib/racc/rdoc/grammar.en.rdoc

@@ -20,7 +20,7 @@ The class block is formed like this:
     [token declarations]
     [expected number of S/R conflicts]
     [options]
-    [semantic value convertion]
+    [semantic value conversion]
     [start rule]
   rule
     GRAMMARS