Fix comment

Author: arsenm

llvm/utils/TableGen/Common/InstructionEncoding.cpp

@@ -14,7 +14,6 @@
 
 using namespace llvm;
 
-/// If this is explictly set value, return true for second.
 std::pair<std::string, bool>
 InstructionEncoding::findOperandDecoderMethod(const CodeGenTarget &Target,
                                               const Record *Record) {

llvm/utils/TableGen/Common/InstructionEncoding.h

@@ -138,6 +138,8 @@ class InstructionEncoding {
   /// Returns information about the operands' contribution to this encoding.
   ArrayRef<OperandInfo> getOperands() const { return Operands; }
 
+  /// \returns the effective value of the DecoderMethod field.t If DecoderMethod
+  /// is an explictly set value, return false for second.
   static std::pair<std::string, bool>
   findOperandDecoderMethod(const CodeGenTarget &Target, const Record *Record);