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merge revision(s) 57352: [Backport #13132]

    doc: improve documentation for Binding [ci skip]

    * remove explicit return from code examples
    * grammar fixes
    * other small fixes

    Patch by: Marcus Stollsteimer <sto.mar@web.de>

    [ruby-core:79082] [Bug #13132]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@58123 b2dd03c8-39d4-4d8f-98ff-823fe69b080e