Docs example updated for Sinilink XY-WPCE

[darmach]

Sinilink XY-WPCE brings output high on reboot / loss of wifi triggering inadvertent action on connected PC. Setting it to off on boot fixes this behaviour.

Brief description of the changes

Type of changes

• New device
• Update existing device
• Removing a device
• General cleanup
• Other

Checklist:

• There are no passwords or secrets references in any examples.
  The only exceptions are !secret wifi_ssid and !secret wifi_password.
• The wifi or ethernet block has no static / manual ip address specified.
• The first configuration provided should be hardware definitions only.
  A more involved example can be provided in a separate configuration block.

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[darmach]

It would be great if anyone could test this on their hardware (possible different hardware revisions?) - in my case the restart of ESP device or it loosing the network connection (which I think caused reboot into captive portal?) caused virtual power button being pushed.