Fix a couple of Doxygen comment issues pointed out by -Wdocumentation.

llvm-svn: 163721
diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp b/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
index 18961fd..ab80e45 100644
--- a/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
@@ -217,7 +217,7 @@
   ///
   /// \param Inst - The instruction to relax, which may be the same
   /// as the output.
-  /// \parm Res [output] - On return, the relaxed instruction.
+  /// \param [out] Res On return, the relaxed instruction.
   void relaxInstruction(const MCInst &Inst, MCInst &Res) const {
   }