[DOCS] Added link to new troubleshooting entry.
Original commit: elastic/x-pack-elasticsearch@642e4bbf18869d741908dc4097b5a08f8fd122d7
Use the information in this section to troubleshoot common problems and find
answers for frequently asked questions.
+* <<security-auth-failure-upgrade>>
* <<security-trb-settings>>
* <<security-trb-roles>>
* <<security-trb-extraargs>>
@@ -36,7 +37,7 @@ internal indices].
There are two situations where it's necessary to manually upgrade the
`.security` index:
-* After upgrading directly to $version from 5.5 or earlier.
+* After upgrading directly to {version} from 5.5 or earlier.
* After restoring a snapshot from 5.5 or earlier that contains a `.security`
index in the old format to a 6.0 cluster.
