[clang-tools-extra] [clang-doc] Add --asset option to clang-doc (PR #94717)

[Paul Kirth via cfe-commits]

================
@@ -81,6 +81,12 @@ static llvm::cl::list<std::string> UserStylesheets(
     llvm::cl::desc("CSS stylesheets to extend the default styles."),
     llvm::cl::cat(ClangDocCategory));
 
+static llvm::cl::opt<std::string>
+    UserAssetPath("asset",
+                  llvm::cl::desc("User supplied asset path for html output to "
+                                 "override the default css and js files"),
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ilovepi wrote:

```suggestion
                  llvm::cl::desc("User supplied asset path to "
                                 "override the default css and js files for html output"),
```

https://github.com/llvm/llvm-project/pull/94717