[css-align] rules on synthesizing baselines are split across two sections

[dbaron]

At the end of the section on Baseline Alignment Terminology, there's a rule (a paragraph with two list items following) saying:

For the purpose of synthesizing baselines of boxes whose block flow direction is parallel to the axis of the alignment context:

• If the box establishing the alignment context has a block flow direction that is orthogonal to the axis of the alignment context, use its writing mode.
• Otherwise, assume either horizontal-tb or vertical-lr writing-mode, whichever is orthogonal to the box’s own writing-mode.

I think this should be in the previous section, on Determining the Baselines of a Box, since that's where the rules on synthesizing baselines are.

[fantasai]

Okay, I checked in a fix, but I had to actually change some of the prose in addition to moving it because the context wasn't there. I'd appreciate a review from you, @dbaron, and @tabatkins!

[dbaron]

Seems fine to me. (Although I wonder if the "use" in the first bullet should be "assume" like the others.)