[llvm] [VPlan] Document current status. (PR #85689)

[via llvm-commits]

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@@ -248,3 +291,6 @@ References
 
 .. [9] "Extending LoopVectorizer: OpenMP4.5 SIMD and Outer Loop
     Auto-Vectorization", Intel Vectorizer Team, LLVM Developers' Meeting 2016.
+
+.. [10] "VPlan: Status Update and Future Roadmap", Florian Hahn, LLVM
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ayalz wrote:

```suggestion
.. [10] "VPlan: Status Update and Future Roadmap", Florian Hahn and Ayal Zaks, LLVM
```


https://github.com/llvm/llvm-project/pull/85689