fix array syntax in new service

Signed-off-by: Mateusz Żak <mateusz.zak@robotec.ai>

Author: zakmat

srv/SpawnEntities.srv

@@ -1,12 +1,12 @@
 # Spawn multiple entities (robots, objects) by name or URI.
 # Support for this interface is indicated through the SPAWNING_ENTITIES value in GetSimulatorFeatures.
 
-SpawnEntity spawn_requests[]            # List of spawn requests.
+SpawnEntity[] spawn_requests            # List of spawn requests.
 
 ---
 
 # Additional result.result_code values for this service. Check result.error_message for further details.
 uint8 ENTITIES_SPAWN_FAILED = 150       # There was at least one failed spawn request. Check individual results in the `results`.
 
 Result result                           # If one or more requests failed, it will give ENTITIES_SPAWN_FAILED otherwise RESULT_OK
-SpawnResult results[]                   # List of results for each spawn request.
+SpawnResult[] results                   # List of results for each spawn request.