docs(OxVehicle): replace player.set with vehicle.set (#257)

Signed-off-by: zoov <84139171+zoovdev@users.noreply.github.com>

Author: zoovdev

pages/ox_core/Classes/Server/OxVehicle.mdx

@@ -137,7 +137,7 @@ vehicle.save()
 Stores a value in the vehicle's metadata, which will be saved to the database (_this behaviour is likely to be removed_).
 
 ```lua
-player.set(key, value)
+vehicle.set(key, value)
 ```
 
 **Parameters**
@@ -208,4 +208,4 @@ vehicle.setStored(value, despawn)
 **Parameters**
 
 - value?: `string`
-- despawn?: `boolean`
+- despawn?: `boolean`