Updating the ST7789 docs page to show limitation (#2018)

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@ -16,6 +16,10 @@ ST7789V (`datasheet <https://github.com/Xinyuan-LilyGO/TTGO-T-Display>`__,
displays with ESPHome. Note that this component utilizes the 4-Wire :ref:`SPI bus <spi>`; the physical
connection is already in place on the TTGO T-Display module as shown below.
.. note::
Currently this only supports 135x240 pixel ST7789V displays. Other sizes (e.g. 240x320, 240x240) are not supported.
.. figure:: images/st7789v-full.jpg
:align: center
:width: 75.0%