Add a newline to the edition error message.

PiperOrigin-RevId: 809235619

Author: pefoley2

src/google/protobuf/compiler/command_line_interface.cc

@@ -2707,9 +2707,11 @@ bool CommandLineInterface::EnforceProtocEditionsSupport(
 
     if (edition > ProtocMaximumEdition()) {
       std::cerr << absl::Substitute(
-          "$0: is a file using edition $1, which is later than the protoc "
-          "maximum supported edition $2.",
-          fd->name(), edition, ProtocMaximumEdition());
+                       "$0: is a file using edition $1, which is later than "
+                       "the protoc "
+                       "maximum supported edition $2.",
+                       fd->name(), edition, ProtocMaximumEdition())
+                << std::endl;
       return false;
     }
   }