docs: fix typos in UI text

[famouswizard]

Description

caught a few typos while checking the interface and cleaned them up:

• испоользования → использования
• синхронизируетмя → синхронизируется
• посещенеи → посещение

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Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

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Note

Fixes minor typos in Russian UI copy within app/_locales/ru/messages.json for backup/sync and basic configuration texts.

• i18n (ru):
  • Correct typos in app/_locales/ru/messages.json for backupAndSyncEnableDescription, backupAndSyncManageWhatYouSyncDescription, and basicConfigurationDescription.

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[famouswizard]

I have read the CLA Document and I hereby sign the CLA