* gdb.texinfo (Sample Session, Invocation, Quitting GDB)

	* gdb.texinfo (Sample Session, Invocation, Quitting GDB)
	(Command Syntax, Signals, Backtrace, Connecting)
	(Remote configuration, Renesas Boards, Console I/O): Fix last
	change: use Ctrl- instead of C-, except wrt Emacs.
	(File-I/O Examples): Put Ctrl-c in @kbd.
	(Cygwin Native, File-I/O Overview, The Ctrl-C message)
	(Console I/O): Use @samp with Ctrl-.