fix a typo [ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51032 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Author: znz

ChangeLog

@@ -33,7 +33,7 @@ Thu Jun 25 17:32:33 2015  Koichi Sasada  <ko1@atdot.net>
 
 	* vm_method.c (method_definition_reset): remove duplicated insertion.
 
-	* vm_method.c (rb_method_entry_clone): assgine dst->def here,
+	* vm_method.c (rb_method_entry_clone): assign dst->def here,
 	  not in method_definition_reset().
 
 Thu Jun 25 16:44:54 2015  Koichi Sasada  <ko1@atdot.net>