[RISCV] Adjust some comments.

llvm/lib/Support/RISCVISAInfo.cpp

@@ -770,6 +770,7 @@ struct ImpliedExtsEntry {
   bool operator<(StringRef Other) const { return Name < Other; }
 };
 
+// Note: The table needs to be sorted by name.
 static constexpr ImpliedExtsEntry ImpliedExts[] = {
     {{"v"}, {ImpliedExtsV}},
     {{"zfh"}, {ImpliedExtsZfh}},

llvm/lib/Target/RISCV/RISCVInstrInfoZk.td

@@ -1,4 +1,4 @@
-//===- RISCVInstrInfoZk.td - RISC-V Scalar Crypto instructions - tablegen -*===//
+//===- RISCVInstrInfoZk.td - RISC-V 'Zk' instructions ------*- tablegen -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.