[css-align] Superfluous "(minus any 'legacy' keywords)" in align-self prose

https://drafts.csswg.org/css-align-3/#align-self-property
"... the computed value of align-items on the parent (minus any 'legacy'
keywords) on all other boxes ..."

But align-items doesn't have 'legacy' values:
https://drafts.csswg.org/css-align-3/#propdef-align-items
so the parenthetical remark above can be removed.

Thanks,
Mats