Time based media EO references

[mbgower]

fulfils request from @shawna-slh :

While you are working on time-based media updates, would you be willing to add to the Understanding documents — I guess in the the Related Resources section if not elsewhere — links to the appropriate pages of Making Audio and Video Media Accessible? e.g., for Understanding 1.2.2 add link to Captions/Subtitles in Making Audio and Video Media Accessible.

I added an items to the Resources section of the A and AA Understanding docs, and in AAA where there was material that seemed to be specific to the SC. Six in total.

Also
resolves #4341
I added in some trivial corrections to the 1.2 Time-based media understanding doc to close a recent issue.

[shawna-slh]

Thanks @mbgower ! I only had time for a quick skim.

A minor request: "W3C Web Accessibility Initiative" -> "W3C Web Accessibility Initiative (WAI)"

Will this get propagated to Understanding docs for 2.1 & 2.2, too?

[shawna-slh]

Thanks!

[mbgower]

Thanks @mbgower ! I only had time for a quick skim.

A minor request: "W3C Web Accessibility Initiative" -> "W3C Web Accessibility Initiative (WAI)"

Done

Will this get propagated to Understanding docs for 2.1 & 2.2, too?

We do not touch the 2.0 space, but it will appear in 2.2 and 2.1 versions.

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[mbgower]

resolves #4341 outstanding typos as well.