[css-scroll-snap] Remove paragraph about mixing 1D and 2D snap positions, as that's no longer possible du.

Author: fantasai

css-scroll-snap/Overview.bs

@@ -813,11 +813,6 @@ Types of Scrolling Methods {#scroll-types}
 		or a tiled image gallery
 		(using ''mandatory'' 2D snap positions to force each image to be centered on the screen).
 
-	Mixing <a>1D</a> and <a>2D</a> snap positions within a single <a>scroll container</a> is discouraged,
-	as the behavior can be hard to predict.
-	Nevertheless, this specification provides guidance on how to deal with mixed <a>snap positions</a>,
-	as the design of the properties does not prevent such a mixture.
-
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