[ruby-cvs:57590] hsbt:r50442 (trunk): * doc/syntax/control_expressions.rdoc: fix a missing "a"

[hsbt at ruby-lang.org]

hsbt	2015-05-08 15:06:03 +0900 (Fri, 08 May 2015)

  New Revision: 50442

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=50442

  Log:
    * doc/syntax/control_expressions.rdoc: fix a missing "a"
      [fix GH-888][ci skip] Patch by @riffraff

  Modified files:
    trunk/ChangeLog
    trunk/doc/syntax/control_expressions.rdoc