Add docs to public functions

app/src/main/java/chat/rocket/android/push/PushManager.kt

@@ -95,6 +95,9 @@ object PushManager {
         hostToPushMessageList.remove(host)
     }
 
+    /**
+     * Remove a notification solely by it's unique id.
+     */
     fun clearNotificationsByNotificationId(notificationId: Int) {
         if (hostToPushMessageList.isNotEmpty()) {
             for (entry in hostToPushMessageList.entries) {
@@ -105,6 +108,9 @@ object PushManager {
         }
     }
 
+    /**
+     * Clear notifications by the host they belong to and its unique id.
+     */
     fun clearNotificationsByHostAndNotificationId(host: String?, notificationId: Int?) {
         if (host == null || notificationId == null) {
             return