[llvm] [llvm][docs] Reorder Stacked PR approaches in GitHub.rst (PR #138126)

[Paschalis Mpeis via llvm-commits]

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@@ -274,8 +264,24 @@ Your options are as follows:
 
    This approach allows GitHub to display clean, incremental diffs for each PR
    in the stack, making it much easier for reviewers to see what has changed at
-   each step. Once `feature_1` is merged, you can rebase and re-target
-   `feature_2` to `main`.
+   each step. Once `feature_1` is merged, GitHub will automatically rebase and
+   re-target your branch `feature_2` to `main`. For more complex stacks, you can
+   perform this step using the web interface.
+
+   This approach requires
+   `Commit Access <https://llvm.org/docs/DeveloperPolicy.html#obtaining-commit-access>`_.
+   However, if you are involved with a Stacked PR, there's a good chance you'll
+   be granted access.
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paschalis-mpeis wrote:

Hey Andrzej,

Good points, and thanks for your review!

I've kept the link and now it refers on how to obtain commit access. – or do you think it's better to remove it?

https://github.com/llvm/llvm-project/pull/138126