sys/ztimer: mention ztimer_auto_adjust in relevant places #21003
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Contribution description
Since #17633, there is an alternative to configuring the ztimer overhead compensation in the board.h file. Mention this in the relevant places in the documentation and the test application.
While we are at it, also fixing a typo in the test application.
Testing procedure
Check generated doc and changes to README.
Issues/PRs references
Stumbled upon this while going through https://doc.riot-os.org/porting-boards.html#board-timer-configurations for #20980. Interesting enough that this configuration values are currently only set for a handful of boards 👀