updated lockTimeout javadoc

Author: rashtao

src/main/java/com/arangodb/model/StreamTransactionOptions.java

@@ -44,8 +44,10 @@ public Integer getLockTimeout() {
     }
 
     /**
-     * @param lockTimeout an optional numeric value that can be used to set a timeout for waiting on collection locks. If not
-     *                    specified, a default value will be used. Setting lockTimeout to 0 will make ArangoDB not time out
+     * @param lockTimeout a numeric value that can be used to set a timeout in seconds for
+     *                    waiting on collection locks. This option is only meaningful when using
+     *                    exclusive locks. If not specified, a default value of 900 seconds will be
+     *                    used. Setting lockTimeout to 0 will make ArangoDB not time out
      *                    waiting for a lock.
      * @return options
      */

src/main/java/com/arangodb/model/TransactionOptions.java

@@ -71,8 +71,10 @@ public Integer getLockTimeout() {
     }
 
     /**
-     * @param lockTimeout an optional numeric value that can be used to set a timeout for waiting on collection locks. If not
-     *                    specified, a default value will be used. Setting lockTimeout to 0 will make ArangoDB not time out
+     * @param lockTimeout a numeric value that can be used to set a timeout in seconds for
+     *                    waiting on collection locks. This option is only meaningful when using
+     *                    exclusive locks. If not specified, a default value of 900 seconds will be
+     *                    used. Setting lockTimeout to 0 will make ArangoDB not time out
      *                    waiting for a lock.
      * @return options
      */