[clang-tools-extra] [llvm] [clang][clang-doc] Add basic e2e test to clang-doc (PR #93928)

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``````````bash
darker --check --diff -r 98714866830f505d7bb87de6b92a28f280a34b9b...4a3c4d98156b9f0d9355980108c453c56ef0e353 clang-tools-extra/test/lit.cfg.py
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View the diff from darker here.
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``````````diff
--- lit.cfg.py	2024-06-06 19:38:03.000000 +0000
+++ lit.cfg.py	2024-06-06 19:40:59.617978 +0000
@@ -72,11 +72,11 @@
 )
 
 config.substitutions.append(("%clang_tidy_headers", clang_tidy_headers))
 
 clang_doc_install = os.path.join(
-    os.path.dirname(shutil.which("clang-doc")),  "..", "share", "clang"
+    os.path.dirname(shutil.which("clang-doc")), "..", "share", "clang"
 )
 
 config.substitutions.append(("%clang_doc_install", clang_doc_install))
 
 # Plugins (loadable modules)

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https://github.com/llvm/llvm-project/pull/93928