update doc.

Signed-off-by: Aramis Sennyey <sennyeya@amazon.com>

.changeset/young-chairs-check.md

@@ -2,4 +2,4 @@
 '@backstage/core-app-api': patch
 ---
 
-Apps will now detect when a relative `backend.baseUrl` or `app.baseUrl` is provided and update it to be a full URL. This means that you can provide relative URLs and they will be resolved as expected across the application.
+Apps will now rewrite `app.baseUrl` and `backend.baseUrl` to match `location.origin` when `app.baseUrl` is the same as `backend.baseUrl`. This will help reduce the number of front end builds you have to do with a specific config.

packages/core-app-api/src/app/AppManager.tsx

@@ -168,7 +168,7 @@ function useConfigLoader(
    * We only want to override the URLs with the document origin when the URLs match
    *  and are defined. We use getOptionalString here to not throw when the app.baseUrl
    *  and backend.baseUrl are not defined. If they are defined but not well formatted URLs
-   *  the above resolveRelativeUrl() method will throw.
+   *  the above getRelativeUrl() method will throw.
    */
   if (
     configReader.getOptionalString('app.baseUrl') &&