Make the behaviour of SentryAndroid.init clearer in multiprocess (#14279)

## IS YOUR CHANGE URGENT?  

Help us prioritize incoming PRs by letting us know when the change needs
to go live.
- [ ] Urgent deadline (GA date, etc.): <!-- ENTER DATE HERE -->
- [ ] Other deadline: <!-- ENTER DATE HERE -->
- [x] None: Not urgent, can wait up to 1 week+

## PRE-MERGE CHECKLIST

*Make sure you've checked the following before merging your changes:*

- [ ] Checked Vercel preview for correctness, including links
- [x] PR was reviewed and approved by any necessary SMEs (subject matter
experts)
- [ ] PR was reviewed and approved by a member of the [Sentry docs
team](https://github.com/orgs/getsentry/teams/docs)

Author: chromy

docs/platforms/android/configuration/multi-process-apps.mdx

@@ -15,4 +15,4 @@ The Sentry Android SDK will not automatically initialize in non-main processes b
     tools:node="merge" />
 ```
 
-Alternatively, you can call `SentryAndroid.init(...)`.
+Alternatively, you can call `SentryAndroid.init(...)` in each process where you want to initialize Sentry.