include i2c requirement in docs (#2742)

* include i2s requirement in docs

mention the requirement for i2s to be set up for this sensor to function

* Update mics_4514.rst

* Update mics_4514.rst
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@ -10,9 +10,12 @@ This component exposes the different gas concentration sensors from the `MiCS-45
.. note::
The sensor has a 3-minute warmup period where data is unreliable and ESPHome will only start publishing sensor values after this time.
If the sensor was already powered only, such as if you restarted or updated your ESPHome device, then it will start publishing immediately.
The :ref:`I²C Bus <i2c>` is required to be set up in your configuration for this sensor to work.
.. code-block:: yaml
# Example configuration entry