Fix typo on location tracking description

[Joehuu]

Summary

Noticed quickly when setting up the app for the first time, and wanted to fix the typo myself.

Screenshots

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Link to pull request in Documentation repository

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Any other notes

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[homeassistant]

Hi @Joehuu,

It seems you haven't yet signed a CLA. Please do so here.

Once you do that we will be able to review and accept this pull request.

Thanks!