Nullability annotations (#857)

Author: Jawnnypoo

parse/src/main/java/com/parse/CachedCurrentInstallationController.java

@@ -23,8 +23,7 @@ class CachedCurrentInstallationController
      * while holding this current installation lock. (We used to use the ParseInstallation.class lock,
      * but moved on to an explicit lock object since anyone could acquire the ParseInstallation.class
      * lock as ParseInstallation is a public class.) Acquiring the instance mutex while holding this
-     * current installation lock will lead to a deadlock. Here is an example:
-     * https://phabricator.fb.com/P3251091
+     * current installation lock will lead to a deadlock.
      */
     private final Object mutex = new Object();
 

parse/src/main/java/com/parse/CachedCurrentUserController.java

@@ -22,8 +22,7 @@ class CachedCurrentUserController implements ParseCurrentUserController {
      * Note about lock ordering:
      * <p>
      * You must NOT acquire the ParseUser instance mutex (the "mutex" field in ParseObject) while
-     * holding this static initialization lock. Doing so will cause a deadlock. Here's an example:
-     * https://phabricator.fb.com/P17182641
+     * holding this static initialization lock. Doing so will cause a deadlock.
      */
     private final Object mutex = new Object();
     private final TaskQueue taskQueue = new TaskQueue();