Merge pull request #2451 from leochr/update-short-desc

Update short description of websphere-liberty and open-liberty

open-liberty/README-short.txt

@@ -1 +1 @@
-Open Liberty multi-architecture images based on Ubuntu 18.04
+Open Liberty multi-architecture images based on Ubuntu

websphere-liberty/README-short.txt

@@ -1 +1 @@
-WebSphere Liberty multi-architecture images based on Ubuntu 18.04
+WebSphere Liberty multi-architecture images based on Ubuntu