fix grammatical mistake [ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61446 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2017-12-24 10:12:21 +00:00 · 2017-12-24 10:12:21 +00:00 · 874da405bd
--- a/2
+++ b/2
@ -239,7 +239,7 @@ with all sufficient information, see the ChangeLog file or Redmine

    * BigDecimal.ver

-  * BigDecimal#clone and #dup now does not make a new instance,
+  * BigDecimal#clone and #dup now do not make a new instance,
    but returns the receiver itself.

 * Coverage