Docs/updates april (#7418)

* fixed typos and broken links

* updated python_api.md

* fixed CityObjectLabel API docs

* added load_world_if_different to API docs

* added return type to reload_world

* updated python_api.md

Docs/python_api.md

@@ -506,6 +506,7 @@ _</font>
 Reload the current world, note that a new world is created with default settings using the same map. All actors present in the world will be destroyed, __but__ traffic manager instances will stay alive.  
     - **Parameters:**
         - `reset_settings` (_bool_) - Option to reset the episode setting to default values, set to false to keep the current settings. This is useful to keep sync mode when changing map and to keep deterministic scenarios.  
+    - **Return:** _[carla.World](#carla.World)_  
     - **Raises:** RuntimeError when corresponding.  
 - <a name="carla.Client.replay_file"></a>**<font color="#7fb800">replay_file</font>**(<font color="#00a6ed">**self**</font>, <font color="#00a6ed">**name**</font>, <font color="#00a6ed">**start**</font>, <font color="#00a6ed">**duration**</font>, <font color="#00a6ed">**follow_id**</font>, <font color="#00a6ed">**replay_sensors**</font>)  
 Load a new world with default settings using `map_name` map. All actors present in the current world will be destroyed, __but__ traffic manager instances will stay alive.  

PythonAPI/docs/client.yml

@@ -115,6 +115,7 @@
         doc: >
           Option to reset the episode setting to default values, set to false to keep the current settings.
           This is useful to keep sync mode when changing map and to keep deterministic scenarios.
+      return: carla.World
       raises: RuntimeError when corresponding.
       doc: >
         Reload the current world, note that a new world is created with default