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/trunk@57781 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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