NOTE: Make sure you've done {T248016} before this task.
The point of this task is to make sure you are able to push commits to Gerrit. It is not at all important what change you make to the file. You can just add an empty line, or change a letter or a word.
Steps:
- Follow the documentation at https://www.mediawiki.org/wiki/Gerrit/Tutorial to set up your machine to be able to push commits to Gerrit
- Make a trivial change to `tests/selenium/README.md` file of `mediawiki/core` repository
- Push the change to Gerrit
It is very likely you will get confused or stuck. Do not hesitate to ask for help. The best way is to create a subtask of this task and copy/paste as much relevant terminal output as possible. Also mention your operating system (and version) and versions of other relevant tools.