[android] Javadoc changes to clarify OfflineManager methods (#15519)

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/offline/OfflineManager.java

@@ -307,7 +307,7 @@ public class OfflineManager {
   }
 
   /**
-   * Forces revalidation of the ambient cache.
+   * Forces re-validation of the ambient cache.
    * <p>
    * Forces Mapbox GL Native to revalidate resources stored in the ambient
    * cache with the tile server before using them, making sure they
@@ -537,7 +537,13 @@ public class OfflineManager {
   }
 
   /**
-   * Create an offline region in the database.
+   * Creates an offline region in the database by downloading the resources needed to use
+   * the given region offline.
+   * <p>
+   * As of version 8.3.0 of the Maps SDK for Android, offline tile requests are no longer exempt from
+   * billing on mobile. Developers are subject to separate Vector Tile or Raster Tile API pricing for
+   * offline use. See <a href="https://www.mapbox.com/pricing/">our pricing page</a> for more information.
+   * </p>
    * <p>
    * When the initial database queries have completed, the provided callback will be
    * executed on the main thread.
@@ -609,10 +615,15 @@ public class OfflineManager {
   }
 
   /**
-   * Changing or bypassing this limit without permission from Mapbox is prohibited
-   * by the Mapbox Terms of Service.
+   * Sets the maximum number of Mapbox-hosted tiles that may be downloaded and stored on the current device.
+   * By default, the limit is set to 6,000.
+   * <p>
+   * Once this limit is reached, {@link OfflineRegion.OfflineRegionObserver#mapboxTileCountLimitExceeded(long)}
+   * fires every additional attempt to download additional tiles until already downloaded tiles are removed
+   * by calling {@link OfflineRegion#deleteOfflineRegion(OfflineRegion.OfflineRegionDeleteCallback)}.
+   * </p>
    *
-   * @param limit the new tile count limit.
+   * @param limit the maximum number of tiles allowed to be downloaded
    */
   @Keep
   public native void setOfflineMapboxTileCountLimit(long limit);