[clang-tools-extra] [clang-tidy] Add a fully custom message to `bugprone-unsafe-functions` (PR #162443)

[Donát Nagy via cfe-commits]

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@@ -69,6 +69,11 @@ Potentially Breaking Changes
   - `CharTypdefsToIgnore` to `CharTypedefsToIgnore` in
     :doc:`bugprone-signed-char-misuse
     <clang-tidy/checks/bugprone/signed-char-misuse>`
+  
+- Modified the custom message format of :doc:`bugprone-unsafe-functions
+  <clang-tidy/checks/bugprone/unsafe-functions>` by hiding the default suffix
+  when the reason starts with the character `>` in the `CustomFunctions` option.
+  The warning locations are not changed, but the message is different.
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NagyDonat wrote:

Perhaps highlight that this only changes the behavior in the unlikely case when the configured reason already started with `>`.

https://github.com/llvm/llvm-project/pull/162443