fix(docs): Fix some sphinx-build warnings including duplicate header names

Author: hmakelin

docs/pages/developer_guide/sitl_environment/gis_server.rst

@@ -1,6 +1,6 @@
 GIS server
 ______________________________________________________
-Introduction
+Overview
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 GISNav requires access to a GIS server that serves high resolution `orthoimagery`_ and optional
 `digital elevation models`_ (DEM) for the approximate location of the aircraft. The orthoimage and DEM `rasters`_ are

docs/pages/developer_guide/sitl_environment/install_gisnav.rst

@@ -2,7 +2,7 @@ GISNav ROS package
 ____________________________________________________
 Install ROS 2
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-If you followed the :ref:`Autopilot` SITL install instructions you should already have ROS 2 installed. See
+If you followed the :ref:`Autopilots` SITL install instructions you should already have ROS 2 installed. See
 `ROS 2 foxy install instructions`_  if you do not yet have ROS 2 on your machine. You can check your
 ROS version with the ``whereis ros2`` command:
 

docs/pages/developer_guide/test/test_prerequisites.rst

@@ -1,4 +1,4 @@
-Prerequisites
+Test prerequisites
 ____________________________________________________
 .. note::
     Install the :ref:`Development dependencies` before you attempt to run any tests in this section

gisnav/data.py

@@ -13,6 +13,7 @@
     except DataValueError as dve:
         self.get_logger().warn(f'Error determining vehicle position:\n{dve},\n{traceback.print_exc()}.')
         return None
+
 """
 from __future__ import annotations  # Python version 3.7+
 

gisnav/nodes/map_node.py

@@ -1,6 +1,6 @@
-"""Contains :class:`.Node` that provides :class:`OrthoImage3D`s"""
+"""Contains :class:`.Node` that provides :class:`OrthoImage3D` s"""
 import time
-from typing import Optional, Tuple, List, Union, get_args
+from typing import Optional, Tuple, get_args
 
 import numpy as np
 import cv2