[clang-tools-extra] [clang-tidy] Add user-defined functions to `bugprone-unsafe-functions` check (PR #106350)

[via cfe-commits]

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@@ -45,8 +47,7 @@ The following functions are always checked, regardless of *Annex K* availability
  - ``rewind``, suggested replacement: ``fseek``
  - ``setbuf``, suggested replacement: ``setvbuf``
 
-If `ReportMoreUnsafeFunctions
-<unsafe-functions.html#cmdoption-arg-ReportMoreUnsafeFunctions>`_ is enabled,
+If :ref:`ReportMoreUnsafeFunctions<option-ReportMoreUnsafeFunctions>` is enabled,
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whisperity wrote:

```suggestion
If :option:`ReportMoreUnsafeFunctions` is enabled,
```

https://github.com/llvm/llvm-project/pull/106350