Update xh_hk4401.md (#1308)

Added more verbiage to existing doc and pointed towards some feedback related to possible updates to existing doc

docs/xh_hk4401.md

@@ -1,5 +1,7 @@
 # XH-HK4401 4-port HDMI USB KVM Switch
 
+!!! warning "This document was supplied by a community member, thus it is not officially endorsed or supported."
+
 {!_multiport_usb.md!}
 
 <img src="xh-hk4401.jpg" alt="drawing" width="300"/>
@@ -292,3 +294,5 @@ The UI can be updated to add buttons to switch between KVM inputs and indicators
 ## Switching between hosts in the UI
 
 To switch between hosts, enter the KVM UI and click the "GPIO" menu. You should see 4 inputs, one of which will have a green circle indicating it is currently selected. Click the other inputs to change the selected host.
+
+Please review this latest [issue](https://github.com/pikvm/pikvm/issues/1306) for an update to the existing instructions