migration: Improve json and formatting

Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231013104736.31722-2-quintela@redhat.com>

qapi/migration.json

@@ -73,7 +73,7 @@
 { 'struct': 'MigrationStats',
   'data': {'transferred': 'int', 'remaining': 'int', 'total': 'int' ,
            'duplicate': 'int',
-           'skipped': { 'type': 'int', 'features': ['deprecated'] },
+           'skipped': { 'type': 'int', 'features': [ 'deprecated' ] },
            'normal': 'int',
            'normal-bytes': 'int', 'dirty-pages-rate': 'int',
            'mbps': 'number', 'dirty-sync-count': 'int',
@@ -440,10 +440,9 @@
 #     compress and xbzrle are both on, compress only takes effect in
 #     the ram bulk stage, after that, it will be disabled and only
 #     xbzrle takes effect, this can help to minimize migration
-#     traffic.  The feature is disabled by default.  (since 2.4 )
+#     traffic.  The feature is disabled by default.  (since 2.4)
 #
-# @events: generate events for each migration state change (since 2.4
-#     )
+# @events: generate events for each migration state change (since 2.4)
 #
 # @auto-converge: If enabled, QEMU will automatically throttle down
 #     the guest to speed up convergence of RAM migration.  (since 1.6)