merge revision(s) 57781:

	docs for IO.{write,read}

	* io.c: [DOC] improve docs for IO
	  * IO.{write,read}: fix errors (:open_args is not an array of
	    strings, it might include a perm or options hash argument;
	    IO.write has no length argument, drop corresponding statement),
	    improve formatting, call-seq, grammar.
	  * IO#sync=: remove unnecessary "produces no output".
	  * other improvements.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@57930 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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