Review 27712

Pass to address spelling issues. Most of these are just in comments or user-facing messages, but there were a couple that could impact script behavior. E.g. Server/test/ and Unsupported/Maintenance/ looking at files or paths that don't exist.

Other notes..
1. I did not do anything with PDF files as I assume those are automatically generated.
2. This pass did address SDP-637, although I did it in the .adoc and .html files instead of the PDF.
3. I eventually realized Robert may have written some of these but I'd already saved the files changing things like "customisation" -> "customization" or "behaviour" -> "behavior". Sorry :(
#3: Change 27722 committed into //guest/perforce_software/sdp 70 0 0
Tip: Use n and p to cycle through the changes.