[DOC] refined

* Adjusted indentation in license section, and used "(c)"
* Commented out invalid syntax to enable highlighting
* Removed unnecessary parentheses

ext/pty/pty.c

@@ -464,7 +464,7 @@ pty_close_pty(VALUE assoc)
 /*
  * call-seq:
  *   PTY.open => [master_io, slave_file]
- *   PTY.open {|(master_io, slave_file)| ... } => block value
+ *   PTY.open {|master_io, slave_file| ... } => block value
  *
  * Allocates a pty (pseudo-terminal).
  *
@@ -497,7 +497,7 @@ pty_close_pty(VALUE assoc)
  *   require 'io/console'
  *   PTY.open {|m, s|
  *     s.raw!
- *     ...
+ *     # ...
  *   }
  *
  */
@@ -737,7 +737,7 @@ static VALUE cPTY;
  *
  * == License
  *
- *  C) Copyright 1998 by Akinori Ito.
+ * (c) Copyright 1998 by Akinori Ito.
  *
  * This software may be redistributed freely for this purpose, in full
  * or in part, provided that this entire copyright notice is included