merge revision(s) r45495: [Backport #9662]
* README.EXT: fix typo.
[ruby-core:61634] [Bug #9662]
* README.EXT.ja: ditto.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@46662 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) r45495: [Backport #9662]
[ruby-core:61634] [Bug #9662]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@46662 b2dd03c8-39d4-4d8f-98ff-823fe69b080e