[DOCS] use 2.2.1 docs for the 2.2.x

Author: j143

_src/_data/navigation.yml

@@ -31,8 +31,8 @@ topnav:
     url: https://systemds.apache.org/docs/3.0.0/
   - title: Release Notes 3.0.0
     url: https://systemds.apache.org/release-notes/systemds-release-notes-3.0.0
-  - title: 2.2.2 (stable)
-    url: https://systemds.apache.org/docs/2.2.2/
+  - title: 2.2.x (stable)
+    url: https://systemds.apache.org/docs/2.2.1/
   - title: Release Notes 2.2.x
     url: https://systemds.apache.org/release-notes/systemds-release-notes-2.2.x