Fix the tick_loop example documentation layout.

Before:
![Before](https://api.monosnap.com/image/download?id=1MCTshDaqk3xG93sh3SuFGtLGtZVNW)

After:
![After](https://api.monosnap.com/image/download?id=LFDwaWzWX0tSk9d9MEYHCpP35ny2eN)