Revisit Javadoc for 5.1.0 (#9266)

* [android] - revisit public API javadoc

* [android] fix javadoc minor mistakes and typos

* grammar tweak

* add missing public javadoc

1 files changed, 6 insertions, 0 deletions

diff --git a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/offline/OfflineManager.java b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/offline/OfflineManager.java
index 95cb7d66c4..d572d696db 100644
--- a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/offline/OfflineManager.java
+++ b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/offline/OfflineManager.java
@@ -115,6 +115,12 @@ public class OfflineManager {
     }).start();
   }
 
+  /**
+   * Get the single instance of offline manager.
+   *
+   * @param context the context used to host the offline manager
+   * @return the single instance of offline manager
+   */
   public static synchronized OfflineManager getInstance(Context context) {
     if (instance == null) {
       instance = new OfflineManager(context);