Fix markdown formatting for 'oscillating' field in Vesync (home-assistant#41848)

Author: joostlek

source/_integrations/vesync.markdown

@@ -134,7 +134,7 @@ VeSync air purifiers will expose the following details depending on the features
 | `mode`                  | The current mode the device is in. (LV-PUR131S, Core200S/300s/400s)               | manual          |
 | `speed`                 | The current speed setting of the device. (LV-PUR131S, Core200S/300s/400s)         | high            |
 | `speed_list`            | The available list of speeds supported by the device. (LV-PUR131S)                | high            |
-| 'oscillating'           | If the fan is currently oscillating                                               | True            |
+| `oscillating`           | If the fan is currently oscillating                                               | True            |
 | `active_time`           | The number of seconds since the device has been in a non-off mode. (LV-PUR131S)   | 1598            |
 | `screen_status`         | The current status of the screen. (LV-PUR131S)                                    | on              |
 | `night_light`           | The current status of the night light (Core200S/Core400s)                         | off             |