[llvm] [docs] Strengthen our quality standards and connect AI contribution policy to it (PR #154441)

[Hubert Tong via llvm-commits]

================
@@ -1,79 +1,37 @@
 # LLVM AI Tool Use Policy
 
+## Policy
+
 LLVM's policy is that contributors can use whatever tools they would like to
-craft their contributions, but **contributors must read and review all
-LLM-generated code or text before they ask other project members to review
-it.** The contributor is always the author and is fully accountable for their
-contributions. Contributors should be sufficiently confident that the
-contribution is high enough quality that asking for a review is a good use of
-scarce maintainer time.
+craft their contributions, but there must be a **human in the loop**.
+**Contributors must read and review all LLM-generated code or text before they
+ask other project members to review it.** The contributor is always the author
+and is fully accountable for their contributions. Contributors should be
+sufficiently confident that the contribution is high enough quality that asking
+for a review is a good use of scarce maintainer time, and they should be **able
+to answer quesions about their work** during review.
----------------
hubert-reinterpretcast wrote:

Typo:
```suggestion
to answer questions about their work** during review.
```

https://github.com/llvm/llvm-project/pull/154441