[clang-tools-extra] [clang-tidy] Add avoid-pragma-once. (PR #140388)

[Baranov Victor via cfe-commits]

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@@ -142,6 +142,11 @@ New checks
   Finds potentially erroneous calls to ``reset`` method on smart pointers when
   the pointee type also has a ``reset`` method.
 
+- New :doc:`portability-avoid-pragma-once
+  <clang-tidy/checks/portability/avoid-pragma-once>` check.
+
+  A check that catches pragma once.
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vbvictor wrote:

When you change `portability/avoid-pragma-once.rst` don't forget to sync this line with new docs

https://github.com/llvm/llvm-project/pull/140388