[ios, macos] document custom API URL & add Info.plist guide (#6833)

Also support base URL nullability in order to use default value. 

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diff --git a/platform/macos/docs/Info.plist Keys.md b/platform/macos/docs/Info.plist Keys.md
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+# Info.plist Keys
+
+The Mapbox macOS SDK supports custom `Info.plist` keys in your application in order to configure various settings. 
+
+## MGLMapboxAccessToken
+
+Set the [Mapbox access token](https://www.mapbox.com/help/define-access-token/) to be used by all instances of `MGLMapView` in the current application.
+
+Mapbox-hosted vector tiles and styles require an API access token, which you can obtain from the [Mapbox account page](https://www.mapbox.com/studio/account/tokens/). Access tokens associate requests to Mapbox’s vector tile and style APIs with your Mapbox account. They also deter other developers from using your styles without your permission.
+
+As an alternative, you can use `+[MGLAccountManager setAccessToken:]` to set a token in code. See [our guide](https://www.mapbox.com/help/ios-private-access-token/) for some tips on keeping access tokens in open source code private. 
+
+## MGLMapboxAPIBaseURL
+
+Use this key if you need to customize the API base URL used throughout the SDK. If unset, the default Mapbox API is used. 
+
+The default value is `https://api.mapbox.com`.