qapi/rocker: Tidy up query-rocker-of-dpa-flows example

The command can return any number of RockerOfDpaFlow objects.  The
example shows it returning exactly two, with the second object's
members elided.  Tweak it so it elides elements after the first
instead.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20250404121413.1743790-3-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[Commit message typo fixed]

qapi/rocker.json

@@ -254,7 +254,7 @@
 #                       "action": {"goto-tbl": 10},
 #                       "mask": {"in-pport": 4294901760}
 #                      },
-#                      {...},
+#                      ...
 #        ]}
 ##
 { 'command': 'query-rocker-of-dpa-flows',