X86Disassembler.cpp: Fix @param introduced in r199804. [-Wdocumentation]

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199855 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/Disassembler/X86Disassembler.cpp

@@ -260,7 +260,6 @@ static bool translateSrcIndex(MCInst &mcInst, InternalInstruction &insn) {
 /// translateDstIndex   - Appends a destination index operand to an MCInst.
 ///
 /// @param mcInst       - The MCInst to append to.
-/// @param operand      - The operand, as stored in the descriptor table.
 /// @param insn         - The internal instruction.
 
 static bool translateDstIndex(MCInst &mcInst, InternalInstruction &insn) {