Incorporated style changes for CFC

Hello everyone,
Since we?re about to do a CFC, I?ve generated a PR that is entirely about matching W3C style in our technical document.

https://github.com/w3c/wcag/pull/4080

All of these style changes have been discussed before (and are part of our own style guide as well as in place for the wider W3C and EO guides), but I had been delaying implementing in order to avoid conflicts with other omnibus changes.

There is no content altered as part of this beyond setting some initial capitals to lower case, and the altering of ?website? into one word (unlike web page).

It will go through as part of the CFC, but I thought I would flag to members of the TF for a quick review. Apologies for not having it ready for last Friday.

Thanks!
Mike

PS The matching changes in the non-normative docs are still forthcoming; they obviously do not have the publishing constraints of the technical document.