cs: update wal comments (#3334)
cs: update wal comments (#3334)

* cs: update wal comments

Follow-up to https://github.com/tendermint/tendermint/pull/3300

* Update consensus/wal.go

Co-Authored-By: melekes <4e728e5ac82d1892ead7b81ffedd355eff2f2823@gmail.com>

tendermint/tendermint,tendermint/tendermint,tendermint/tendermint,tendermint/tendermint