Issue #11730 has been reported by Kazuhiro NISHIYAMA.

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Bug #11730: read_nonblock's call-seq missing options
https://bugs.ruby-lang.org/issues/11730

* Author: Kazuhiro NISHIYAMA
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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`IO#write_nonblock` call-seq has `[, options]`, but `IO#read_nonblock` does not.

In prelude.rb:

~~~
  # call-seq:
  #    ios.read_nonblock(maxlen)              -> string
  #    ios.read_nonblock(maxlen, outbuf)      -> outbuf
~~~

~~~
  # call-seq:
  #    ios.write_nonblock(string)   -> integer
  #    ios.write_nonblock(string [, options])   -> integer
~~~



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