[clang-tools-extra] [clang-tidy] align all help message in run-clang-tidy (PR #96199)

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``````````bash
darker --check --diff -r 22530e7985083032fe708848abb88b77be78e5ce...03bc40a343227cb839ec908492c0d904be9af654 clang-tools-extra/clang-tidy/tool/run-clang-tidy.py
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View the diff from darker here.
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``````````diff
--- run-clang-tidy.py	2024-06-20 14:37:23.000000 +0000
+++ run-clang-tidy.py	2024-06-20 14:41:07.204466 +0000
@@ -348,11 +348,14 @@
         type=int,
         default=0,
         help="number of tidy instances to be run in parallel.",
     )
     parser.add_argument(
-        "files", nargs="*", default=[".*"], help="files to be processed (regex on path)."
+        "files",
+        nargs="*",
+        default=[".*"],
+        help="files to be processed (regex on path).",
     )
     parser.add_argument("-fix", action="store_true", help="apply fix-its.")
     parser.add_argument(
         "-format", action="store_true", help="Reformat code after applying fixes."
     )

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https://github.com/llvm/llvm-project/pull/96199