Address review comments

Author: imkiva

clang/include/clang/Basic/BuiltinsRISCV.td

@@ -152,7 +152,7 @@ def ntl_store : RISCVBuiltin<"void(...)">;
 //===----------------------------------------------------------------------===//
 let Features = "zihintpause" in {
 def pause : RISCVBuiltin<"void(...)">;
-} // Features = "zihintntl"
+} // Features = "zihintpause"
 
 //===----------------------------------------------------------------------===//
 // XCV extensions.

llvm/lib/Target/RISCV/RISCVInstrInfoZihintpause.td

@@ -5,6 +5,13 @@
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 
+//===----------------------------------------------------------------------===//
+//
+// This file describes the RISC-V instructions from the standard Pause Hint
+// extension (Zihintpause).
+//
+//===----------------------------------------------------------------------===//
+
 let Predicates = [HasStdExtZihintpause] in {
   def : Pat<(int_riscv_pause), (FENCE 0x1, 0x0)>;
 }