Update ping.markdown (#12215)

* Update ping.markdown

* Update ping.markdown
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Azimoth 2020-03-02 10:16:16 +00:00 committed by GitHub
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@ -89,7 +89,7 @@ device_tracker:
{% configuration %}
hosts:
description: List of device names and their corresponding IP address or hostname.
description: List of device names and their corresponding IP address or hostname. Device names must conform to the standard requirements of lower case, numbers and underscore only - see [entity names](/configuration/troubleshooting/#entity-names).
required: true
type: list
count: