[css-align] Editorial: align-self:normal "as described for 'justify-self'"

https://drafts.csswg.org/css-align-3/#align-self-property
"The 'normal' keyword represents the "default" alignment for
the layout mode. Its behavior depends on the layout model,
as described for 'justify-self'."

The 'align-self' text then spells out the behavior of 'normal'
for the various box types anyway, so the "as described for
'justify-self'" text should be removed.
('justify-self' doesn't describe 'normal' for Flex Items anyway)

Alternatively, you could remove the 'normal' descriptions from
'justify-self' and add "as described for 'align-self'" there
instead.  I'd prefer if it's written out in both places though,
since it's just a few lines of text and it makes the document
more readable.

/Mats