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Update pcf8574.rst (#2608)

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* Update pcf8574.rst

* Update components/pcf8574.rst

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
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@ -55,6 +55,9 @@ Configuration variables:
Defaults to ``0x21``.
- **pcf8575** (*Optional*, boolean): Whether this is a 16-pin PCF8575. Defaults to ``false``.
.. note::
If you use PCF8575, pin numbers are from 0 to 15, not 0 to 7 and 10 to 17 as datasheet states!
Pin configuration variables:
****************************