ios-overview: Update Find My description

[redoomed1]

Changes proposed in this PR:

• iOS Overview
  • Update Find My description
  • Closes #2609
  • Modify "custom Android operating system" internal link to point to a more specific section
  • Rename "stolen data protection" to "Stolen Device Protection" to properly reflect the name of the feature
• Make minor grammar changes otherwise not noted above

- [x] I agree to the terms listed below:

Contribution terms (click to expand)

1) I am the sole author of this work. 2) I agree to grant Privacy Guides a perpetual, worldwide, non-exclusive, transferable, royalty-free, irrevocable license with the right to sublicense such rights through multiple tiers of sublicensees, to reproduce, modify, display, perform, relicense, and distribute my contribution as part of this project. 3) I have disclosed any relevant conflicts of interest in my post. 4) I agree to the Community Code of Conduct.

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