Remove broken NCAM link

[momdo]

Apply the removal of NCAM link made in PR #3484 to other files.

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[w3cbot]

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

[bruce-usab]

@awkawk any suggestions for a substitute?

[awkawk]

@bruce-usab Having left NCAM just over 20 years ago, I'm limited to google search, but this is the link that I think would be the replacement: https://www.wgbh.org/foundation/services/ncam/tools-resources/accessible-digital-media-guidelines-guideline-h-multimedia

[patrickhlauke]

happy to change this from link removal to link update, thanks @awkawk (when this came up last week, i did suggest that perhaps because it's about SMIL, and it's a mostly defunct technology now, if it's even worth it...)

[awkawk]

@patrickhlauke I wouldn't disagree with that assessment, but there may be uses that I'm not aware of (e.g. within DTB's?)

[patrickhlauke]

@awkawk done