update release notes

documentation/RELEASE_NOTES.html

@@ -30,6 +30,20 @@ release.</p>
 
 -->
 
+<h3>epicsTimeGetCurrent() optimization</h3>
+
+<p>Add a fast path to epicsTimeGetCurrent() and related calls
+in the common case where only the default OS current time provider is
+registered.  This path does not take the global mutex guarding
+the time providers list, potentially reducing lock contention.</p>
+
+<h3>dbEvent tweak Queue size</h3>
+
+<p>The size of the queue used by dbEvent to push monitor updates
+has been slightly increased based on DBR_TIME_DOUBLE to better fill
+an ethernet frame.  This may result in slightly fewer, but larger
+frames being sent.</p>
+
 <h1 align="center">EPICS Release 7.0.2.2</h1>
 
 <h3>Build System changes</h3>