[css-align] Two editorial nits

https://drafts.csswg.org/css-align-3/#propdef-align-content

defines both justify-content/align-content, but the intro
below the syntax block:
"Aligns the contents of the box as a whole along the box's
inline/row/main axis." only applies to justify-content.

Each container type then has "The 'align-content' property
applies..." later in the text so it reasonably clear that
the intro is for justify-content but it's a bit confusing
at first.

Consider qualifying the intro like so:
"'justify-content' aligns the contents ... axis.
For 'align-content', see below."

                   * * *

https://drafts.csswg.org/css-align-3/#propdef-justify-items
https://drafts.csswg.org/css-align-3/#propdef-justify-self

The value syntax has different order of <overflow-position> /
<self-position>.  It would be easier to compare the syntax of
these properties if they used the same order for these terms.

(ditto for align-items/self)


Thanks,
Mats