qapi: fix example of MEMORY_FAILURE

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>