Address comments.

Author: ksromanov

clang-tools-extra/clang-tidy/cppcoreguidelines/ProTypeUnionAccessCheck.cpp

@@ -25,8 +25,9 @@ void ProTypeUnionAccessCheck::check(const MatchFinder::MatchResult &Result) {
   const auto *Matched = Result.Nodes.getNodeAs<MemberExpr>("expr");
   SourceLocation Loc = Matched->getMemberLoc();
   if (Loc.isInvalid())
-     Loc = Matched->getBeginLoc();
-  diag(Loc, "do not access members of unions; use (boost::)variant instead");
+    Loc = Matched->getBeginLoc();
+  diag(Loc, "do not access members of unions; consider using (boost::)variant "
+            "instead");
 }
 
 } // namespace clang::tidy::cppcoreguidelines