remove image heights

boards/beaglebone/ai/index.rst

@@ -29,7 +29,6 @@ BeagleBone AI is based on the Texas Instruments AM5729 dual-core Cortex-A15 SoC
 .. image:: images/BB_AI_handheld_500px.jpg
     :width: 500
     :align: center
-    :height: 333
     :alt: BeagleBone AI
 
 .. toctree::

boards/beaglebone/black/index.rst

@@ -30,7 +30,6 @@ Boot Linux in under 10 seconds and get started on development in less than 5 min
 .. image:: media/image1.jpg
    :width: 598
    :align: center
-   :height: 400
    :alt: BeagleBone Black
 
 .. toctree::