Apple: Document Data Collected

[philprime]

Description

See getsentry/team-sdks#82

[kahest]

WIP on Java/Android via getsentry/sentry-java#4092 - we can take a few hints based on the Android docs

[kahest]

Re-opening this because we need to add information on which of the collected data items are guarded by sendDefaultPii. We're also missing collected user information (most importantly ip address). See the Android docs as example

[philippsuess]

Good catch @kahest. I opened #12833 to fix this.

[kahest]

@philipphofmann thanks 👍 I only now realized that we don't use sendDefaultPii anywhere else (did a quick code search), otherwise I would've opened the PR myself 😅 we should follow up on this though, other SDKs use the flag much more, there's probable more place where it'd make sense for sentry-cocoa to use it