[clang] fix comment parsing of special commands with non-alphanumeric names. fixes #33296

Author: Brock Denson

clang/test/AST/ast-dump-comment.cpp

@@ -136,4 +136,4 @@ void Test_TemplatedFunctionVariadic(int arg, ...);
 int Test_UnderscoreInSpecialCommand;
 // CHECK:      VarDecl{{.*}}Test_UnderscoreInSpecialCommand 'int'
 // CHECK:        InlineCommandComment{{.*}} Name="thread_safe" RenderNormal
-// CHECK-NEXT:     TextComment{{.*}} Text=" test for underscore in special command"
+// CHECK-NEXT:     TextComment{{.*}} Text=" test for underscore in special command"