[clang-tools-extra] [clang-tidy] Teach `modernize-deprecated-headers` about more no-op headers (PR #165674)

[Baranov Victor via cfe-commits]

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@@ -3,12 +3,55 @@
 modernize-deprecated-headers
 ============================
 
-Some headers from C library were deprecated in C++ and are no longer welcome in
-C++ codebases. Some have no effect in C++. For more details refer to the C++14
-Standard [depr.c.headers] section.
-
-This check replaces C standard library headers with their C++ alternatives and
-removes redundant ones.
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vbvictor wrote:

Could we leave this as first sentence in docs? But remove "This check" in favor of "Replaces ..."

https://github.com/llvm/llvm-project/pull/165674