[clang-tools-extra] [clang-doc][NFC] refactor out file helpers (PR #134298)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp,h -- clang-tools-extra/clang-doc/support/File.cpp clang-tools-extra/clang-doc/support/File.h clang-tools-extra/clang-doc/HTMLGenerator.cpp
``````````

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<details>
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View the diff from clang-format here.
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``````````diff
diff --git a/clang-tools-extra/clang-doc/support/File.cpp b/clang-tools-extra/clang-doc/support/File.cpp
index a9162bee8..b1fe6f6d8 100644
--- a/clang-tools-extra/clang-doc/support/File.cpp
+++ b/clang-tools-extra/clang-doc/support/File.cpp
@@ -12,8 +12,7 @@
 namespace clang {
 namespace doc {
 
-llvm::Error
-copyFile(llvm::StringRef FilePath, llvm::StringRef OutDirectory) {
+llvm::Error copyFile(llvm::StringRef FilePath, llvm::StringRef OutDirectory) {
   llvm::SmallString<128> PathWrite;
   llvm::sys::path::native(OutDirectory, PathWrite);
   llvm::sys::path::append(PathWrite, llvm::sys::path::filename(FilePath));
@@ -29,14 +28,13 @@ copyFile(llvm::StringRef FilePath, llvm::StringRef OutDirectory) {
   return llvm::Error::success();
 }
 
-
 llvm::SmallString<128> computeRelativePath(llvm::StringRef Destination,
                                            llvm::StringRef Origin) {
   // If Origin is empty, the relative path to the Destination is its complete
   // path.
   if (Origin.empty())
     return Destination;
-  
+
   // The relative path is an empty path if both directories are the same.
   if (Destination == Origin)
     return {};
diff --git a/clang-tools-extra/clang-doc/support/File.h b/clang-tools-extra/clang-doc/support/File.h
index fc52d185a..828da7df3 100644
--- a/clang-tools-extra/clang-doc/support/File.h
+++ b/clang-tools-extra/clang-doc/support/File.h
@@ -14,11 +14,10 @@
 namespace clang {
 namespace doc {
 
-llvm::Error 
-copyFile(llvm::StringRef FilePath, llvm::StringRef OutDirectory);
+llvm::Error copyFile(llvm::StringRef FilePath, llvm::StringRef OutDirectory);
 
-llvm::SmallString<128> 
-computeRelativePath(llvm::StringRef Destination,llvm::StringRef Origin);
+llvm::SmallString<128> computeRelativePath(llvm::StringRef Destination,
+                                           llvm::StringRef Origin);
 
 } // namespace doc
 } // namespace clang

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https://github.com/llvm/llvm-project/pull/134298