Fix typo on mobile browsers page

[elleybean]

Changes proposed in this PR:

• Correct subsection of Safari section which mistakenly reads Firefox

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[github-actions[bot]]

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[privacyguides-bot]

This pull request has been mentioned on Privacy Guides. There might be relevant details there:

https://discuss.privacyguides.net/t/2024-04-08/17760/1