[internutopia] Fix doc link

Author: uzuku

source/en/user_guide/internutopia/advanced_tutorials/how-to-add-controller.md

@@ -67,7 +67,7 @@ class DifferentialDriveController(BaseController):
 
 The `action_to_control` method translates the input action into joint signals to apply in each step.
 
-For complete list of controller methods, please refer to the [Controller API documentation](../../api/robot.rst#module-internutopia.core.robot.controller).
+For complete list of controller methods, please refer to the [Controller API documentation](../../../api/robot.rst#module-internutopia.core.robot.controller).
 
 Please note that the registration of the controller class is done through the `@BaseController.register` decorator, and the registered name **MUST** match the value of `type` field within the corresponding controller config class (here is `DifferentialDriveController`).
 

source/en/user_guide/internutopia/advanced_tutorials/how-to-add-robot.md

@@ -84,7 +84,7 @@ Please note that the registration of the robot class is done through the `@BaseR
 
 [`IArticulation`](../../../api/articulation.rst) is an interface class to deal with any articulated object in InternUtopia. Robot is one kind of articulated object, so here we use it to control the robot.
 
-For users who want to get state of a certain rigid link of robot, we provide the `self._rigid_body_map` containing all rigid links of the robot with prim path as key. All the links within are of [`IRigidBody`](../../../api/rigidbody.rst) type which is an interface class to deal with rigid bodies.
+For users who want to get state of a certain rigid link of robot, we provide the `self._rigid_body_map` containing all rigid links of the robot with prim path as key. All the links within are of [`IRigidBody`](../../../api/rigid_body.rst) type which is an interface class to deal with rigid bodies.
 
 An example of g1 robot class implementation is shown as following:
 

source/en/user_guide/internutopia/advanced_tutorials/how-to-add-sensor.md

@@ -60,7 +60,7 @@ class DepthCamera(BaseSensor):
 
 The `get_data` method gets the sensor data in each step.
 
-For complete list of sensor methods, please refer to the [Sensor API documentation](../../api/robot.rst#module-internutopia.core.robot.sensor).
+For complete list of sensor methods, please refer to the [Sensor API documentation](../../../api/sensor.rst).
 
 Please note that the registration of the sensor class is done through the `@BaseSensor.register` decorator, and the registered name should match the value of `type` field within the corresponding sensor config class (here is `DepthCamera`).
 

source/en/user_guide/internutopia/tutorials/core-concepts.md

@@ -67,7 +67,7 @@ env.close()
     <source src="../../../_static/video/tutorial_minimum.webm" type="video/webm">
 </video>
 
-Config must contain at least one task config. After the config is created, we can create the env to run the task in simulation. It is important to note that all the extension and packages must be imported **BEFORE** env creation to ensure all extensions can be resolved properly. In the example above, we wrap them in the `import_extensions()`.
+Config must contain at least one task config. After the config is created, we can create the env to run the task in simulation. It is important to note that all the extension and packages must be imported **BEFORE** env creation to ensure all extensions to be resolved properly. In the example above, we wrap them in the `import_extensions()`.
 
 Once the env is created, the first thing to do is to reset the env to load the first episode. And then we can step the env to run the simulation.