editorial: remove vague "meaningful" and parenthetical example

[pkra]

Following up on #2062. Closes #2068

In this negation, it seems very vague (what is non-meaningful-but-not-empty alt?) and I think a clear "SHOULD NOT add alt" is better.

Otherwise, if there's a use case for "non-meaningful text alternative" then perhaps this can be added to the parenthetical example.

To further reduce confusion, the parenthical example using an empty alt attribute was also removed.

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Preview | Diff

[pkra]

if we really don't intend to allow alt="" on role="none" then fine - but I'm not sure that is the intent. If it is then we need to change the example too.

E.g., nu validator flags it as error "An img element which has an alt attribute whose value is the empty string must not have a role attribute."

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[pkra]

@jnurthen I've added your suggestion. Can I merge this?

[pkra]

@jnurthen another ping.

@scottaohara are you still ok with this adjustment?

[spectranaut]

couldn't fix the merge conflicts so I added a new PR: https://github.com/w3c/aria/pull/2505

in order to close/merge this :)

[spectranaut]

closing, merged replace PR