doc(android): fix incorrect GradlePlugin* preferences

[erisu]

Motivation and Context

Fix incorrect Android GradlePlugin(*) preferences.

Fixes #1362

Description

• One of the preferences GradlePluginGoogleServicesEnabled is listed twice when it should be GradlePluginGoogleServicesVersion (Fixed all the way back to 10.x docs.)
• Removed invalid preference AndroidGradlePluginGoogleServicesVersion. (12.x & dev docs.)
• Removed invalid preference AndroidGradlePluginGoogleServicesEnabled. (12.x & dev docs.)
• Removed duplicated preference GradlePluginKotlinEnabled from dev docs.

Testing

Built docs.

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