Update feature-branches.mdx (#12330)

Author: adinauer

develop-docs/sdk/miscellaneous/feature-branches.mdx

@@ -23,6 +23,8 @@ If you still want the nice GH diff and have CI run on your changes:
 
 ## Alternative solution A (used for Java SDK `8.x.x` branch)
 
+This does not show the full history on each file. The history only works on the full repo. Please try another method.
+
 - Create a PR for merging `main` into `8.x.x`
 - Once that PR is merged into `8.x.x` there will still be conflicts shown in the PR for merging `8.x.x` back to `main`
 - Do another merge of `main` into `8.x.x` where you accept all changes on the `8.x.x` branch and create an empty merge commit