doc updates

Author: seven-mile

clang/include/clang/CIR/Dialect/IR/CIRAttrs.td

@@ -663,8 +663,9 @@ def AddressSpaceAttr : CIR_Attr<"AddressSpace", "addrspace"> {
 
   let summary = "Address space attribute for pointer types";
   let description = [{
-    The address space attribute is used in pointer types. It essentially models
-    `clang::LangAS` rather than the LLVM address space.
+    The address space attribute is used in pointer types. It essentially
+    provides a unified model on top of `clang::LangAS`, rather than LLVM address
+    spaces.
 
     The representation is further simplified: `LangAS::Default` is encoded as
     a null attribute; many address spaces from different offloading languages

clang/lib/CIR/Dialect/Transforms/TargetLowering/Targets/SPIR.cpp

@@ -1,4 +1,4 @@
-//===- AArch64.cpp --------------------------------------------------------===//
+//===- SPIR.cpp - TargetInfo for SPIR and SPIR-V --------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.