Merge pull request #6347 from yyforyongyu/5388-rm-revc-log

lnwallet+channeldb: store minimal info in revocation log bucket

docs/release-notes/release-notes-0.15.0.md

@@ -278,6 +278,11 @@ from occurring that would result in an erroneous force close.](https://github.co
 * Add [htlc expiry protection](https://github.com/lightningnetwork/lnd/pull/6212)
 to the htlc interceptor API.
 
+* In order to safely advance commitment state, `lnd` saves the past states and
+  constructs a justice transaction in case of a remote breach. The states can
+  grow very large on disk given a busy operating channel, [which is now changed
+  with a space deduction over (at least) 96 percents.](https://github.com/lightningnetwork/lnd/pull/6347) 
+
 ## Documentation
 
 * Improved instructions on [how to build lnd for mobile](https://github.com/lightningnetwork/lnd/pull/6085).