[TableGen] Correct comments for end of namespace. NFC

Summary:
Update end-of-namespace comments generated by
tablegen emitters to fulfill the rules setup by
clang-tidy's llvm-namespace-comment checker.

Fixed a few end-of-namespace comments in the
tablegen source code as well.

Reviewers: craig.topper

Reviewed By: craig.topper

Subscribers: craig.topper, stoklund, dschuff, sbc100, jgravelle-google, aheejin, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66396

llvm-svn: 369865
diff --git a/llvm/utils/TableGen/WebAssemblyDisassemblerEmitter.cpp b/llvm/utils/TableGen/WebAssemblyDisassemblerEmitter.cpp
index 365cba5..54aa5a8 100644
--- a/llvm/utils/TableGen/WebAssemblyDisassemblerEmitter.cpp
+++ b/llvm/utils/TableGen/WebAssemblyDisassemblerEmitter.cpp
@@ -167,7 +167,7 @@
     OS << " },\n";
   }
   OS << "  { 0, nullptr }\n};\n\n";
-  OS << "} // End llvm namespace\n";
+  OS << "} // end namespace llvm\n";
 }
 
 } // namespace llvm