[clang-tools-extra] [clang-tidy] Fix readability-identifier-naming FP on function templates (PR #198517)

[Victor Chernyakin via cfe-commits]

================
@@ -0,0 +1,80 @@
+// RUN: %check_clang_tidy -std=c++20 %s readability-identifier-naming %t -- \
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localspook wrote:

```suggestion
// RUN: %check_clang_tidy -std=c++98-or-later %s readability-identifier-naming %t -- \
```

https://github.com/llvm/llvm-project/pull/198517