updated to point to INET 4.4 NED reference docs.

Author: rhornig

_data/menu.yml

@@ -24,8 +24,8 @@
       link: https://inet.omnetpp.org/docs/tutorials
     - name: Technical Presentations
       link: /TechnicalPresentations.html
-    - name: NED Reference v4.2
-      link: https://omnetpp.org/doc/inet/api-4.2.0
+    - name: NED Reference v4.4
+      link: https://omnetpp.org/doc/inet/api-4.4.0
     - name: NED Reference v3.6
       link: https://omnetpp.org/doc/inet/api-3.6.0
     - separator: true