io.c: Fix spelling [ci skip]

* io.c (io_read) Fix spelling in docco for read.  [Fix GH-781]
  try > tries

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48775 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-12-12

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48776 b2dd03c8-39d4-4d8f-98ff-823fe69b080e