qapi: fix example of MEMORY_FAILURE

Example output lacks mandatory member @timestamp.  Provide it.

Example output lacks mandatory member flags.recursive.  Provide it.

Minor: Change quotes from '' to "" in @action-required member.

Signed-off-by: Victor Toso <victortoso@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-Id: <20220328140604.41484-12-victortoso@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Commit message fixed up]
Signed-off-by: Markus Armbruster <armbru@redhat.com>

qapi/run-state.json

@@ -571,7 +571,9 @@
 # <- { "event": "MEMORY_FAILURE",
 #      "data": { "recipient": "hypervisor",
 #                "action": "fatal",
-#                "flags": { 'action-required': false } }
+#                "flags": { "action-required": false,
+#                           "recursive": false } },
+#      "timestamp": { "seconds": 1267061043, "microseconds": 959568 } }
 #
 ##
 { 'event': 'MEMORY_FAILURE',