docs: add upgrading guide for version 10 and update sidebar reference

Author: jeffreylanters

…ntation/docs/upgrading-from-version-9.md documentation/docs/upgrading.mddocumentation/docs/upgrading-from-version-9.md renamed to documentation/docs/upgrading.md documentation/docs/upgrading-from-version-9.md renamed to documentation/docs/upgrading.md

@@ -77,7 +77,7 @@
     },
     {
       "type": "doc",
-      "id": "upgrading-from-version-9"
+      "id": "upgrading"
     },
     {
       "type": "doc",