fix a typo [ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50991 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Author: znz

NEWS

@@ -42,7 +42,7 @@ with all sufficient information, see the ChangeLog file.
     this affect only files opened as binary.  [Feature #11218]
 
 * Thread
-  * Thread#name, Thread#name are added to handle thread names [Feature #11251]
+  * Thread#name, Thread#name= are added to handle thread names [Feature #11251]
 
 * NameError
   * NameError#receiver is added to take the receiver object. [Feature #10881]