Update development_validation.markdown (#5201)

Spelling Mistake
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Jaydev Shiroya 2018-04-17 23:10:53 +05:30 committed by Franck Nijhof
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@ -21,7 +21,7 @@ Besides [voluptuous](https://pypi.python.org/pypi/voluptuous) default types, man
- Time: `time`, `time_zone`
- Misc: `template`, `slug`, `temperature_unit`, `latitude`, `longitude`, `isfile`, `sun_event`, `ensure_list`, `port`, `url`, and `icon`
To validate plaforms using [MQTT](/components/mqtt/), `valid_subscribe_topic` and `valid_publish_topic` are available.
To validate platforms using [MQTT](/components/mqtt/), `valid_subscribe_topic` and `valid_publish_topic` are available.
Some things to keep in mind: