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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/trunk@57352 b2dd03c8-39d4-4d8f-98ff-823fe69b080e