[llvm] [llvm][docs] Update the project and runtimes lists (PR #109788)

[Nikita Popov via llvm-commits]

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@@ -577,7 +577,12 @@ enabled sub-projects. Nearly all of these variable names begin with
 
   The full list is:
 
-  ``clang;clang-tools-extra;cross-project-tests;libc;libclc;lld;lldb;openmp;polly;pstl``
+  ``bolt;clang;clang-tools-extra;compiler-rt;cross-project-tests;libc;libclc;lld;lldb;mlir;openmp;polly;pstl``
+
+  .. note::
+    Some projects listed here can also go in ``LLVM_ENABLE_PROJECTS``. They
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nikic wrote:

I think you meant this?
```suggestion
    Some projects listed here can also go in ``LLVM_ENABLE_RUNTIMES``. They
```

https://github.com/llvm/llvm-project/pull/109788