Add the 2 image events found using git grep 'Job("log"'

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)

docs/sources/reference/commandline/cli.md

@@ -506,6 +506,10 @@ Docker containers will report the following events:
 
     create, destroy, die, export, kill, pause, restart, start, stop, unpause
 
+and Docker images will report:
+
+    untag, delete
+
 ### Examples
 
 You'll need two shells for this example.