Add blurb about backwards compatability to upgrading-sdk-version docs (#5185)

Signed-off-by: Jonathan Berkhahn <[email protected]>

Author: jberkhahn

website/content/en/docs/upgrading-sdk-version/_index.md

@@ -3,3 +3,9 @@ title: Upgrade SDK Version
 weight: 4
 description: Guide to upgrading sdk version for your operator
 ---
+
+## Backwards Compatibility when Upgrading Operator-sdk version
+
+When upgrading your version of Operator-sdk, it is intended that post-1.0.0 minor versions (i.e. 1.y) are backwards compatible and strictly additive. Therefore, you
+only need to re-scaffold your operator with a newer version of Operator-SDK if you wish to take advantage of new features. If you do not wish to use new features,
+all that should be required is bumping the operator image dependency (if a Helm or Ansible operator) and rebuilding your operator image.