Update pulse_counter.rst (#689)

* Update pulse_counter.rst

Would have saved me a lot of time.

* Add space

Co-authored-by: Fabian Affolter <mail@fabian-affolter.ch>
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@ -42,7 +42,7 @@ Configuration variables:
- **internal_filter** (*Optional*, :ref:`config-time`): If a pulse shorter than this
time is detected, its discarded and no pulse is counted. Defaults to ``13us``. On the ESP32,
this value can not be higher than ``13us``, for the ESP8266 you can use larger intervals too.
If you enable this, set up the ``count_mode`` to increase on the falling edge, not leading edge.
If you enable this, set up the ``count_mode`` to increase on the falling edge, not leading edge. For S0 pulse meters that are used to meter power consumption 50-100 ms is a reasonable value.
- **update_interval** (*Optional*, :ref:`config-time`): The interval to check the sensor. Defaults to ``60s``.