* revise RNN spec Signed-off-by: fishbell <bell.song@intel.com> * formatting the formula Signed-off-by: fishbell <bell.song@intel.com> * Update docs/ops/sequence/RNNSequence_5.md Co-authored-by: Tatiana Savina <tatiana.savina@intel.com> Co-authored-by: Tatiana Savina <tatiana.savina@intel.com>