[css-grid] Clarify "grid-modified document order" definition
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Description
https://drafts.csswg.org/css-grid-2/#grid-order
Grid-modified document order (grid order) is the order in which grid items are encountered when traversing the grid’s grid cells. If two items are encountered at the same time, they are taken in order-modified document order.
The definition should clarify that references to this term are supposed to specify the major axis, explain what the major axis is, and probably have a diagram similar to this one from https://en.wikipedia.org/wiki/Row-_and_column-major_order by CMG Lee (CC BY-SA 4.0, no changes made)

Contributor guide
First steps
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- Open a pull request that references the issue number.
Research direction
Start with the CSS Grid 2 grid-order definition linked in the issue. Clarify that references specify the major axis, explain the major axis, and consider adding a row- or column-major-order diagram like the cited example. Done means the definition and any illustration remove the ambiguity around traversal order.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- css
- Domain
- documentation
- Issue type
- Documentation
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100