Minor language fix in git_exercise.md

Author: MakisH

01_version_control/git_exercise.md

@@ -14,7 +14,7 @@ Deadline: **Wednesday, October 30, 2024, 9:00**
 ## Idea of the Exercise
 
 - There are three separate exercises. Each one consists of an individual Python file `exerciseX.py`. The exercises build upon each other, work from one to three. Each exercise is described in the comments at the top of the respective Python file.
-- Each exercise has two tasks A and B. Distribute the two tasks and **work on them in parallel**.
+- Each exercise has two tasks: A and B. Distribute the two tasks and **work on them in parallel**.
 - For each task, create a new branch with an appropriate name (e.g., `ex-1-task-A`) and use appropriate commit messages (not `Solve task A`).
 - When ready, push the new branch via `git push -u <remote> <branchname>` to your own remote and open a pull request to the `main` branch upstream (i.e. use the feature branch workflow, but with feature branches on forks).
 - Assign your partner as reviewer. Review, fix problems, and eventually merge. For the best learning experience, use a different order of steps in every exercise.