doc(android): clarify documentation and types for sdkVersion field

[peitschie]

Platforms affected

Android only

Motivation and Context

Aligning documentation and types! Nothin' special...

Description

As above

Testing

Have confirmed the types work locally for me. No other code changes.

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[breautek]

lgtm