cli: Add example of search with quotes

This patch adds to the documentation of the list command an example of
how to use quotes when the search text contains spaces.

Change-Id: I4ca3f77a33bdec56b4d6630a73e9c3b38a6e7e40
Bug-Url: https://bugzilla.redhat.com/1065945
Signed-off-by: Juan Hernandez <juan.hernandez@redhat.com>