Update custom.rst (#2699)

Adding ID reference cos I spent 3 hours trying to find why I got this error

Couldn't find ID 'my_custom_switch'. Please check you have defined an ID with that name in your configuration.
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Anthony Keane 2023-03-07 19:20:08 +11:00 committed by GitHub
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@ -50,6 +50,7 @@ And in YAML:
switches:
name: "My Custom Switches"
id: my_custom_switch
Configuration variables: