[llvm] Add conduct email contact for the CODE_OF_CONDUCT page (PR #218787)

[Cyndy Ishida via llvm-commits]

================
@@ -1,3 +1,5 @@
 # Code of Conduct
 
 The LLVM Community Code of Conduct can be found at https://llvm.org/docs/CodeOfConduct.html.
+For inquiries about moderation, bans, or other Code of Conduct issues, please
----------------
cyndyishida wrote:

```suggestion
For inquiries about moderation, bans, or related issues, please
```

Maybe something more vague, just in case folks have a narrow definition of a "Code of Conduct" issue. Feel free to take or leave; the overall messaging reads well to me. 

https://github.com/llvm/llvm-project/pull/218787