Fix for home-assistant#28371 - viera documentation (home-assistant#28439)

Co-authored-by: Shalak <github.author@shalak.eu.org>

Author: shalak

source/_integrations/panasonic_viera.markdown

@@ -118,7 +118,7 @@ Some of the known valid key values are:
 - `back`
 - `power`
 
-The list with all known valid keys can be found [here](https://github.com/florianholzapfel/panasonic-viera/blob/521cefadc8e1543514ce41d3d49e9218d1c2302d/panasonic_viera/__init__.py#L35). Additionally, you can also send custom commands, such as `"NRC_HOME-ONOFF"` (which is the same as `home`). Two further undocumented commands are `"NRC_CHG_HDMI1-ONOFF"` and `"NRC_CHG_HDMI1-ONOFF"` for selecting HDMI inputs.
+The list with all known valid keys can be found [here](https://github.com/florianholzapfel/panasonic-viera/blob/521cefadc8e1543514ce41d3d49e9218d1c2302d/panasonic_viera/__init__.py#L35). Additionally, you can also send custom commands, such as `"NRC_HOME-ONOFF"` (which is the same as `home`). Further undocumented commands are `"NRC_HDMI1-ONOFF"`, `"NRC_HDMI2-ONOFF"`, `"NRC_HDMI3-ONOFF"` and `"NRC_HDMI4-ONOFF"` for selecting HDMI inputs and `"NRC_NETFLIX-ONOFF"`, `"NRC_APPS-ONOFF"`, "`NRC_MYAPP-ONOFF`" for apps.
 
 ### Currently known supported models