[clang-tools-extra] [clang-doc][NFC] Prefer static functions for internal APIs (PR #136391)

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


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions h,cpp -- clang-tools-extra/clang-doc/BitcodeReader.cpp clang-tools-extra/clang-doc/Generators.cpp clang-tools-extra/clang-doc/Generators.h clang-tools-extra/clang-doc/Mapper.cpp clang-tools-extra/clang-doc/Serialize.cpp clang-tools-extra/clang-doc/tool/ClangDocMain.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang-tools-extra/clang-doc/tool/ClangDocMain.cpp b/clang-tools-extra/clang-doc/tool/ClangDocMain.cpp
index a3731c915..8e8f7053a 100644
--- a/clang-tools-extra/clang-doc/tool/ClangDocMain.cpp
+++ b/clang-tools-extra/clang-doc/tool/ClangDocMain.cpp
@@ -169,7 +169,7 @@ static llvm::Error getAssetFiles(clang::doc::ClangDocContext &CDCtx) {
 }
 
 static llvm::Error getDefaultAssetFiles(const char *Argv0,
-                                 clang::doc::ClangDocContext &CDCtx) {
+                                        clang::doc::ClangDocContext &CDCtx) {
   void *MainAddr = (void *)(intptr_t)getExecutablePath;
   std::string ClangDocPath = getExecutablePath(Argv0, MainAddr);
   llvm::SmallString<128> NativeClangDocPath;
@@ -205,7 +205,7 @@ static llvm::Error getDefaultAssetFiles(const char *Argv0,
 }
 
 static llvm::Error getHtmlAssetFiles(const char *Argv0,
-                              clang::doc::ClangDocContext &CDCtx) {
+                                     clang::doc::ClangDocContext &CDCtx) {
   if (!UserAssetPath.empty() &&
       !llvm::sys::fs::is_directory(std::string(UserAssetPath)))
     llvm::outs() << "Asset path supply is not a directory: " << UserAssetPath
@@ -217,7 +217,8 @@ static llvm::Error getHtmlAssetFiles(const char *Argv0,
 
 /// Make the output of clang-doc deterministic by sorting the children of
 /// namespaces and records.
-static void sortUsrToInfo(llvm::StringMap<std::unique_ptr<doc::Info>> &USRToInfo) {
+static void
+sortUsrToInfo(llvm::StringMap<std::unique_ptr<doc::Info>> &USRToInfo) {
   for (auto &I : USRToInfo) {
     auto &Info = I.second;
     if (Info->IT == doc::InfoType::IT_namespace) {

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https://github.com/llvm/llvm-project/pull/136391