* enumerator.c: Fix rdoc typo (thanks to Yutaka HARA)

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38793 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

enumerator.c

@@ -198,7 +198,7 @@ enumerator_ptr(VALUE obj)
  *          must not exceed the number expected by +method+
  *
  *  If a block is given, it will be used to calculate the size of
- *  the enumerator (see Enumerator#size=).
+ *  the enumerator (see Enumerator#size).
  *
  * === Example
  *