Merge pull request #16917 from rook/mergify/bp/release-1.18/pr-16916

docs: Remove extra paren from upgrade guide (backport #16916)

Documentation/Upgrade/ceph-upgrade.md

@@ -34,7 +34,7 @@ The following Ceph versions are supported in this release of Rook:
     If you have enabled read affinity, we recommend waiting for v20.2.1 before upgrading to Ceph Tentacle v20.
     If read affinity is enabled with v20.2.0, Rook automatically disables read affinity internally to help avoid this corruption.
     After the upgrade, existing applications must be restarted to fully disable the read affinity in existing volumes.
-    See [this issue](https://github.com/rook/rook/issues/16839)) for more details.
+    See [this issue](https://github.com/rook/rook/issues/16839) for more details.
 
 !!! important
     When an update is requested, the operator will check Ceph's status,