Updated FAQ - No Wi-Fi section (#361)

Added an hint to change Wi-Fi access point channel if the pi is unable to connect to the configured network

pages/faq.md

@@ -267,6 +267,9 @@ Note: if you can't find an answer to your question here, try the [Community FAQ]
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+* If your device is unable to connect to the WiFi network that you have setup check the 2.4 GHz WiFi channel used by your WiFi access point. 
+  If channels 12 to 14 are used (some countries have banned these channels) try to use a channel between 1 and 11.
+  
 * Some Zeros contain a defective Wi-Fi chip. You can either return the device to the store, or try the [software workaround](https://github.com/pikvm/pikvm/issues/137).
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