[JAVA] Relax the CMAP documentation requirement for durations in events (#501)

* what's new: connection even time

Author: rachel-mack

source/whats-new.txt

@@ -59,6 +59,18 @@ The 5.0 driver release introduces the following features:
   ``isNumber()`` and ``asNumber()`` methods match the Java responses for
   equivalent ``Decimal128`` values.
 
+- The ``getElapsedTime()`` method on ``com.mongodb.event.ConnectionReadyEvent``
+  includes the time taken to deliver the ``ConnectionCreatedEvent``. That is,
+  the time returned includes the duration of the
+  ``com.mongodb.event.ConnectionPoolListener.connectionCreated()`` method.
+  
+  The ``getElapsedTime()`` methods on
+  ``com.mongodb.event.ConnectionCheckedOutFailedEvent`` and
+  ``com.mongodb.event.ConnectionCheckedOutEvent`` include the time taken to
+  deliver the ``com.mongodb.event.ConnectionCheckOutStartedEvent``. That is, the
+  time returned includes the duration of the
+  ``com.mongodb.eventConnectionPoolListener.connectionCheckOutStarted()`` method.
+
 - The ``org.mongodb.scala.Observable.completeWithUnit()`` method is deprecated.
   This relates to a :ref:`breaking change about Observables in this version
   <java-breaking-changes-v5.0-observables>`.