[compiler-rt] [compiler-rt][www] replace deprecated LLVM_CONFIG_PATH with LLVM_CMAKE_DIR (PR #71500)

[Chris B via llvm-commits]

================
@@ -123,7 +123,7 @@ <h2>Get it and get involved!</h2>
   <li>cd llvm-project</li>
   <li>mkdir build-compiler-rt</li>
   <li>cd build-compiler-rt</li>
-  <li>cmake ../compiler-rt -DLLVM_CONFIG_PATH=/path/to/llvm-config</li>
+  <li>cmake ../compiler-rt -DLLVM_CMAKE_DIR=/path/to/llvm-project/cmake</li>
----------------
llvm-beanz wrote:

```suggestion
  <li>cmake ../compiler-rt -DLLVM_CMAKE_DIR=/path/to/llvm-project/cmake/modules</li>
```

https://github.com/llvm/llvm-project/pull/71500