[clang-tools-extra] [clang-tidy][doc] align the title style in clang-tidy/index.rst (PR #119938)

[Nicolas van Kempen via cfe-commits]

================
@@ -9,7 +9,7 @@ See also:
 .. toctree::
    :maxdepth: 1
 
-   The list of clang-tidy checks <checks/list>
+   The List of Clang-Tidy Checks <checks/list>
----------------
nicovank wrote:

Maybe?

```suggestion
   List of Clang-Tidy Checks <checks/list>
```

https://github.com/llvm/llvm-project/pull/119938