Minor fixes

Added a synchronized block around a locked method call, updated javadoc
for a method in RecentTasks.

Change-Id: Ie58ac1d1755485902dbb453eb72a1291f9e65861
diff --git a/services/core/java/com/android/server/am/RecentTasks.java b/services/core/java/com/android/server/am/RecentTasks.java
index a3c26cb..05702af 100644
--- a/services/core/java/com/android/server/am/RecentTasks.java
+++ b/services/core/java/com/android/server/am/RecentTasks.java
@@ -77,8 +77,8 @@
     }
 
     /**
-     * Loads the persistent recentTasks for {@code userId} into {@link #mRecentTasks} from
-     * persistent storage. Does nothing if they are already loaded.
+     * Loads the persistent recentTasks for {@code userId} into this list from persistent storage.
+     * Does nothing if they are already loaded.
      *
      * @param userId the user Id
      */