[ruby-cvs:78337] 1fe31737d8 (master): Slightly fix the warning message [ci skip]

"Takashi Kokubun" <[email protected]>
Newsgroups gmane.comp.lang.ruby.cvs
Message-ID <[email protected]> 
Takashi Kokubun	2019-11-26 18:20:19 +0900 (Tue, 26 Nov 2019)

  New Revision: 1fe31737d8

  https://github.com/ruby/ruby/commit/1fe31737d8

  Log:
    Slightly fix the warning message [ci skip]
    
    I'm not sure, but maybe it was gramatically incorrect?

  Modified files:
    lib/irb/context.rb
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