[clang-tools-extra] [llvm] Clang doc test (PR #93928)

[Paul Kirth via llvm-commits]

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@@ -0,0 +1,370 @@
+// RUN: mkdir -p %T/clang-doc/build
+// RUN: mkdir -p %T/clang-doc/include
+// RUN: mkdir -p %T/clang-doc/src
+// RUN: mkdir -p %T/clang-doc/docs
----------------
ilovepi wrote:

```suggestion
// RUN: mkdir -p %t/clang-doc/build
// RUN: mkdir -p %t/clang-doc/include
// RUN: mkdir -p %t/clang-doc/src
// RUN: mkdir -p %t/clang-doc/docs
```
`%T` is deprecated. https://llvm.org/docs/TestingGuide.html#substitutions
Also,  begin w/ `rm -rf %t`. It's probaly also fine to  rewrite the whole thing as a one-liner.
```suggestion
// RUN: rm -rf %t && mkdir -p %t/clang-doc/build %t/clang-doc/include %t/clang-doc/src %t/clang-doc/docs
```

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