[clang-tools-extra] [clang-tidy] Add `readability-redundant-tag` check (PR #210007)

[purnima shrivastava via cfe-commits]

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@@ -97,6 +97,11 @@ Improvements to clang-tidy
 New checks
 ^^^^^^^^^^
 
+- New :doc:`readability-redundant-tag
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purnima-nlp wrote:

Sure sir, my check have only one entry with proper gap, so it's already in alphabetic order, 
Thanks for you feedback, please check my recent commit.

https://github.com/llvm/llvm-project/pull/210007