Fix Doxygen issues:
* wrap code blocks in \code ... \endcode;
* refer to parameter names in paragraphs correctly (\arg is not what most
  people want -- it starts a new paragraph);
* use \param instead of \arg to document parameters in order to be consistent
  with the rest of the codebase.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163902 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Mangler.cpp b/lib/Target/Mangler.cpp
index 05f6fa6..7fe0d0e 100644
--- a/lib/Target/Mangler.cpp
+++ b/lib/Target/Mangler.cpp
@@ -44,7 +44,7 @@
   OutName.push_back('_');
 }
 
-/// NameNeedsEscaping - Return true if the identifier \arg Str needs quotes
+/// NameNeedsEscaping - Return true if the identifier \p Str needs quotes
 /// for this assembler.
 static bool NameNeedsEscaping(StringRef Str, const MCAsmInfo &MAI) {
   assert(!Str.empty() && "Cannot create an empty MCSymbol");