Add troubleshooting info about left over bits from where vsmac might still xamarin sdk?

### Type of issue

Missing information

### Description

Under troubleshooting it might be useful to add some notes about removing previous installations of the android-sdk installed under ~/library/developer/xamarin that were installed by vsmac?

Especially if users go the AS route and have old paths setup (which I'm guessing a majority of VSMAC developers have) it seems like it might be useful to remind those users to update those things.

### Page URL

https://learn.microsoft.com/en-us/dotnet/maui/get-started/installation?view=net-maui-8.0&tabs=visual-studio-code&source=docs

### Content source URL

https://github.com/dotnet/docs-maui/blob/main/docs/get-started/installation.md

### Document Version Independent Id

9a62d421-d009-30b3-843e-a92bfc21c061

### Article author

@davidbritch

### Metadata

* ID: 7607155a-9a56-d752-c5ac-c3aeb6b128bc
* Service: **dotnet-mobile**
* Sub-service: **dotnet-maui**