merge revision(s) r45220:

	* README.EXT.ja: [DOC] Fix typo "macro macro" @utenmiki [Fixes GH-551]
	  https://github.com/ruby/ruby/pull/551


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@45248 b2dd03c8-39d4-4d8f-98ff-823fe69b080e