docs/interop/bitmaps.rst: Fix typos

Pygments and Sphinx get pickier all the time; Sphinx 2.1+ now catches
these errors.

Signed-off-by: John Snow <jsnow@redhat.com>
Reported-by: Aarushi Mehta <mehta.aaru20@gmail.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20190603214653.29369-2-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>

docs/interop/bitmaps.rst

@@ -399,7 +399,7 @@ in any one source bitmap, the target bitmap will mark that segment dirty.
        "arguments": {
          "node": "drive0",
          "target": "new_bitmap",
-         "bitmaps: [ "bitmap0" ]
+         "bitmaps": [ "bitmap0" ]
        }
      }
 
@@ -1437,7 +1437,7 @@ applied:
    .. code:: json
 
     <- {
-         "timestamp": {...}
+         "timestamp": {...},
          "data": {
            "device": "drive0",
            "type": "backup",