Align docs with SDK features

[lcian]

trafficstars

Description

There are some discrepancies between the docs on docs.sentry.io and what's offered in the SDK:

• https://docs.sentry.io/platforms/rust/configuration/releases/ this should mention how to use sessions and that release-health is needed
• https://docs.sentry.io/platforms/rust/configuration/filtering/ here we mention hints but the SDK does not support them
• https://docs.sentry.io/platforms/rust/configuration/options/ we should review this and fix the discrepancies
• https://docs.sentry.io/platforms/rust/usage/ there's some generic information that refers to SDKs in general, make it specific to this SDK
• https://docs.sentry.io/platforms/rust/enriching-events/breadcrumbs/ same as above
• https://docs.sentry.io/platforms/rust/enriching-events/context/ same as above
• https://docs.sentry.io/platforms/rust/data-management/sensitive-data/ same as above
• https://docs.sentry.io/platforms/rust/user-feedback/ should this be here at all? Check other SDKs
• https://docs.sentry.io/platforms/rust/security-policy-reporting/ should this be here at all? Check other SDKs
• document how to set up source code mapping

Fix them.