Fix warnings

source/arguments_edit/build-overviews.rst

@@ -1,5 +1,3 @@
-----
-
 | Parameter Type:
 |  **Boolean**
 | Parameter Domain:
@@ -45,14 +43,14 @@ Example Images
 --------------
 
 True: ``--build-overviews``
-^^^^^^^^^^^^^^^^^^^^^^^
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
 .. figure:: https://user-images.githubusercontent.com/19295950/127073339-6b2a0a4f-6ede-4dc1-8da4-5bc9646de304.png
   :alt: QGIS displaying the generated Overviews
 
   The Layer Properties panel demonstrates that this OpenDroneMap-generated GeoTIFF has internal Overviews.
 
 False: ``null``
-^^^^^^^^^^^^^
+^^^^^^^^^^^^^^^
 .. figure:: https://user-images.githubusercontent.com/19295950/127074349-a3f84c4c-d05c-4bf1-bd7c-790781ad0fe3.png
   :alt: QGIS displaying the file is lacking Overviews