merge revision(s) 55984: [Backport #12692]
* man/irb.1: remove useless -width option. [ruby-dev:49767] [Bug #12692]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@56232 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 55984: [Backport #12692]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@56232 b2dd03c8-39d4-4d8f-98ff-823fe69b080e