[llvm] [llvm][Docs] Clarify release ABI/API compatibility rules (PR #123049)

[Tom Stellard via llvm-commits]

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@@ -349,8 +349,7 @@ Below are the rules regarding patching the release branch:
 
 #. *Bug fix releases* Patches should be limited to bug fixes or very safe
    and critical performance improvements.  Patches must maintain both API and
-   ABI compatibility with the previous major release.
-
+   ABI compatibility with the previous release from the release branch.
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tstellar wrote:

Maybe something like: `ABI compatibility with the X.1.0 release`  I think that's a little more clear than `release from the release branch`.

https://github.com/llvm/llvm-project/pull/123049