rx: Fix typos in rx.cc and rx.md

Signed-off-by: Dhruv Chawla <dhruvc@nvidia.com>

gcc/ChangeLog:

	* config/rx/rx.cc (rx_print_operand): Fix typos.
	(rx_expand_epilogue): Likewise.
	* config/rx/rx.md: Likewise.
2 files changed