add redirects for 3.4 upgrade and downgrade

Author: kay-kim

config/redirects-next.yaml

@@ -236,5 +236,53 @@ type: 'redirect'
 code: 301
 outputs:
   - 'after-v3.2'
+---
+from: /release-notes/3.4-downgrade
+to: /release-notes
+type: 'redirect'
+code: 303
+outputs:
+  - 'before-v3.2'
+---
+from: /release-notes/3.4-downgrade-replica-set
+to: /release-notes
+type: 'redirect'
+code: 303
+outputs:
+  - 'before-v3.2'
+---
+from: /release-notes/3.4-downgrade-sharded-cluster
+to: /release-notes
+type: 'redirect'
+code: 303
+outputs:
+  - 'before-v3.2'
+---
+from: /release-notes/3.4-downgrade-standalone
+to: /release-notes
+type: 'redirect'
+code: 303
+outputs:
+  - 'before-v3.2'
+---
+from: /release-notes/3.4-upgrade-replica-set
+to: /release-notes
+type: 'redirect'
+code: 303
+outputs:
+  - 'before-v3.2'
+---
+from: /release-notes/3.4-upgrade-sharded-cluster
+to: /release-notes
+type: 'redirect'
+code: 303
+outputs:
+  - 'before-v3.2'
+---
+from: /release-notes/3.4-upgrade-standalone
+to: /release-notes
+type: 'redirect'
+code: 303
+outputs:
+  - 'before-v3.2'
 ...
-