[FileCheck] Add missing final dot in comment

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@365190 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/FileCheck.cpp

@@ -660,7 +660,7 @@ void FileCheckPattern::printSubstitutions(const SourceMgr &SM, StringRef Buffer,
         bool UndefSeen = false;
         handleAllErrors(MatchedValue.takeError(),
                         [](const FileCheckNotFoundError &E) {},
-                        // Handled in PrintNoMatch()
+                        // Handled in PrintNoMatch().
                         [](const FileCheckErrorDiagnostic &E) {},
                         [&](const FileCheckUndefVarError &E) {
                           if (!UndefSeen) {