Make source configuration more easy to understand (#17526)

The current description and wording around the source configuration is not really explicit about what the customization actually does. It also doesn't mention that even for configured sources these are not necessarily shown by the media_player when the TV is off, which might be irritating to users.
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@ -136,7 +136,9 @@ Any other [actions](/docs/automation/action/) to power on the device can be conf
## Sources
To obtain complete list of available sources currently configured on the TV, once the webOS TV is configured and linked, while its powered on head to the **Developer Tools** > **States**, find your `media_player.<name>` and use the sources listed in `source_list:` remembering to split them per line into your `sources:` configuration.
To obtain complete list of available sources currently configured on the TV, once the webOS TV is configured and linked, while its powered on head to the **Developer Tools** > **States**, find your `media_player.<name>` and use the sources listed in `source_list:` remembering to split them per line into your `sources:` configuration. If you leave the `sources:` configuration empty, the `media_player` will offer all sources of the TV. If you list a subset of sources in the configuration, only those will be displayed.
Note: it is normal and expected behavior that for a switched-off TV only the Live TV source is offered in the `media_player`, even if you have configured other sources as well. These will show up as soon as the TV is switched on.
## Change channel through play_media service