Backport of Refactor and move wal docs into release/1.15.x#16432

im2nguyen merged 2 commits intorelease/1.15.xhashicorp/consul:release/1.15.xfrom

backport/docs/wal-refactor/secondly-fitting-ravenhashicorp/consul:backport/docs/wal-refactor/secondly-fitting-ravenCopy head branch name to clipboard