“3x3” → “3×3” (#10932)

For typographical happiness

css-anchor-position-1/Overview.bs

@@ -568,7 +568,7 @@ Most common use-cases of anchor positioning
 only need to worry about
 the edges of the positioned element's [=containing block=],
 and the edges of the [=default anchor element=].
-These lines can be thought of as defining a 3x3 grid;
+These lines can be thought of as defining a 3×3 grid;
 'position-area' lets you easily set up the positioned element's [=inset properties=]
 by specifying what area of this [=position-area grid=] you want the positioned element to be in.
 Its syntax is:
@@ -663,7 +663,7 @@ Its syntax is:
 <h4 id=resolving-spans>
 Resolving <<position-area>>s</h4>
 
-The <dfn export>position-area grid</dfn> is a 3x3 grid,
+The <dfn export>position-area grid</dfn> is a 3×3 grid,
 composed of four grid lines in each axis.
 In order: