merge revision(s) 61278,61281: [Backport #13655]

	IO.new doesn't recive "-" as external_encoding [Bug #13655]

	[DOC] `IO.new` accepts `external_encoding`

	Revert part of r61278 [Bug #13655]
	[ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@62937 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 2 deletions

diff --git a/io.c b/io.c
index 524f7d62ef..ef11bda8c6 100644
--- a/io.c
+++ b/io.c
@@ -7558,8 +7558,7 @@ rb_io_make_open_file(VALUE obj)
  *    If +mode+ parameter is given, this parameter will be bitwise-ORed.
  *
  *  :\external_encoding ::
- *    External encoding for the IO.  "-" is a synonym for the default external
- *    encoding.
+ *    External encoding for the IO.
  *
  *  :\internal_encoding ::
  *    Internal encoding for the IO.  "-" is a synonym for the default internal