docs(techdocs-common): add case sentitive migration steps

Co-authored-by: Eric Peterson <ericpeterson@spotify.com>
Signed-off-by: Camila Belo <camilaibs@gmail.com>

plugins/techdocs-backend/config.d.ts

@@ -248,7 +248,12 @@ export interface Config {
     storageUrl?: string;
 
     /**
-     * (Optional)
+     * (Optional and not recommended) Prior to version [0.x.y] of TechDocs, docs
+     * sites could only be accessed over paths with case-sensitive entity triplets
+     * e.g. (namespace/Kind/name). If you are upgrading from an older version of
+     * TechDocs and are unable to perform the necessary migration of files in your
+     * external storage, you can set this value to `true` to temporarily revert to
+     * the old, case-sensitive entity triplet behavior.
      */
     legacyUseCaseSensitiveTripletPaths?: boolean;
   };