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Update TVServices.md

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docs/TVServices.md
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@ -36,8 +36,11 @@ More advanced control of a TV can enabled with two other optional Characteristic
* `Characteristic::PowerModeSelection()` - this write-only Characteristic causes the text "View TV Settings" to appear in the Home App under the Settings page for a TV Accessory. When this text is pressed, the Home App sends an update with value=0 to `Characteristic::PowerModeSelection()` that can be read by HomeSpan using the usual `update()` method
* `Characteristic::ActiveIdentifier()` - this numerical Characteristic is used to control the input source for the TV (e.g. HDMI-1, HDMI-2, Netflix, etc.). It is only used when input sources are defined and linked using `Service::InputSource()` (see below), in which case it is a *required* Characteristic
### `Service::InputSource()`
Use `Service::InputSource()` to create a new input source selection for the TV, such as HDMI-1, HDMI-2, Netflix, etc. The use of `Service::InputSource()` is optional - it is perfectly okay to create a Television Service without the ability to select different Input Sources. However, if used, each Input Source Service added should be defined in the *same* Accessory as the Television Service to which it applies, and ***must*** be linked to that Television Service using `addLink()`. The Home App behaves unexpectedly if it finds any Input Source Services that are not linked to a Television Service. `Service::InputSource()` support the following Characteristics: