update comment

Author: zodman

src/authutil.ts

@@ -53,7 +53,7 @@ function writeRegistryToFile(
   newContents += `${authString}${os.EOL}${registryString}${os.EOL}${alwaysAuthString}`;
   fs.writeFileSync(fileLocation, newContents);
   core.exportVariable('NPM_CONFIG_USERCONFIG', fileLocation);
-  // Export empty node_auth_token so npm doesn't complain about not being able to find it
+  // Export empty node_auth_token if didn't exist so npm doesn't complain about not being able to find it
   core.exportVariable(
     'NODE_AUTH_TOKEN',
     process.env.NODE_AUTH_TOKEN || 'XXXXX-XXXXX-XXXXX-XXXXX'