Replaces the previous name of the working group in Understanding

[momdo]

Replace "WCAG" and "Web Content Accessibility Guidelines" with "Accessibility Guidelines".

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[patrickhlauke]

This one is likely a bit more controversial/not as straightforward, as at the time that WCAG came out, I think the WG was still called that. I think it's possibly safer to leave as is, or to neutralise it by just referring to "the Working Group" to make it applicable to both the old and new names.

[mbgower]

A search on "WCAG working group" revealed 36 results over 19 files in the repo -- more than the 6 files changed here.
I'm going to review each of the other occurrences to confirm if they should likewise be altered.

Note that I also confirmed that many occurrences of "Accessibility Guidelines Working Group" exist, so the proposed term is certainly used in the index file and elsewhere.

@alastc note that I did discover inconsistency between the use of "AG WG" (53 results in 20 files) and "AGWG" (5 results in 3 files) in usage. I am going to correct the far less prevalent occurrences of AGWG at the same time.

[mbgower]

I've determined that other occurrences seem to occur either in old wcag 2 areas not to be updated or in the specification, not relevant non-normative documents, so I will create a separate PR for those the spec changes.

IMO this change looks solid.

[mbgower]

@momdo I cannot find your PR, so I could not make additional changes in it.
One thing I noticed: you missed a few other corrections where the case was not correct. Would you please do a search for
"WCAG Working group" and "WCAG working group" and ensure both are changed to "AG Working Group"

@kfranqueiro this ID is not in the group. What's the easiest way to address?

[bruce-usab]

Discussed during Backlog call today and Mike is on the case!

[momdo]

@mbgower
I'm sorry for the inconvenience...
I found "WCAG Working group" in understanding/conformance.html, so I replaced it.
Could you please check if this commit is correct?

[w3cbot]

kfranqueiro marked as non substantive for IPR from ash-nazg.

[kfranqueiro]

@kfranqueiro this ID is not in the group. What's the easiest way to address?

I've marked this as non-substantive (which I think is fair for this PR?) in order to pass the check.