* Clarify how to append mouse poll to cmdline.txt
* FAQ spelling and wording changes
* Corrected a couple of spelling errors.
* Changed some phrasing into more idiomatic English.
* Merged the two almost identical questions on 500/503 errors.
* Separated the hardware question about the Pi Zero W from the general "I can't connect to Wi-Fi" FAQ.
* Tried to standardise on "I" and question syntax in the question headers.
* Updated and added context for the statement that only Chrome supports a particular extension.
* Changed code quoting in a couple of answers to clarify what is code and what is commentary.