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Update index.rst to provide missing information on the on_value behavior (#3652)

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* Update index.rst to provide missing information on the on_value behavior

The on_value behavior was unclear about what happens when the selected-value is set to the same value as it already was.

* Update components/select/index.rst

Co-authored-by: guillempages <guillempages@users.noreply.github.com>

---------

Co-authored-by: guillempages <guillempages@users.noreply.github.com>
Co-authored-by: H. Árkosi Róbert <robreg@zsurob.hu>
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components/select/index.rst
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@ -70,7 +70,7 @@ For more information on using lambdas with select, see :ref:`select-lambda_calls
``on_value``
************
This automation will be triggered when a new value is published. In :ref:`Lambdas <config-lambda>`
This automation will be triggered whenever a value is set/published, even if the value is the same as before. In :ref:`Lambdas <config-lambda>`
you can get the value from the trigger with ``x`` and the index offset of the selected value with ``i``.
.. code-block:: yaml