Add missing options -t and -v to images subcommand doc

Docker-DCO-1.1-Signed-off-by: Ken ICHIKAWA <ichikawa.ken@jp.fujitsu.com> (github: ichik1)

docs/sources/reference/commandline/cli.rst

@@ -608,8 +608,8 @@ To see how the ``docker:latest`` image was built:
       -a, --all=false: Show all images (by default filter out the intermediate images used to build)
       --no-trunc=false: Don't truncate output
       -q, --quiet=false: Only show numeric IDs
-      --tree=false: Output graph in tree format
-      --viz=false: Output graph in graphviz format
+      -t, --tree=false: Output graph in tree format
+      -v, --viz=false: Output graph in graphviz format
 
 Listing the most recently created images
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~