[css-transforms-1] Fix small mistake (dots count)

Author: afdw

css-transforms-1/Overview.bs

@@ -360,7 +360,7 @@ versus
 
 <a href="https://www.w3.org/TR/css-backgrounds-3/#valdef-background-attachment-fixed">Fixed backgrounds</a> on the root element are affected by any transform specified for that element. For all other elements that are effected by a transform (i.e. have a transform applied to them, or to any of their ancestor elements), a value of ''fixed'' for the 'background-attachment' property is treated as if it had a value of ''background-attachment/scroll''. The computed value of 'background-attachment' is not affected.
 
-Note: If the root element is transformed, the transformation applies to the entire canvas, including any background specified for the root element.  Since <a href="https://www.w3.org/TR/css-backgrounds-3/#special-backgrounds">the background painting area for the root element</a> is the entire canvas, which is infinite, the transformation might cause parts of the background that were originally off-screen to appear. For example, if the root element's background were repeating dots, and a transformation of ''scale(0.5)'' were specified on the root element, the dots would shrink to half their size, but there will be twice as many, so they still cover the whole viewport.
+Note: If the root element is transformed, the transformation applies to the entire canvas, including any background specified for the root element.  Since <a href="https://www.w3.org/TR/css-backgrounds-3/#special-backgrounds">the background painting area for the root element</a> is the entire canvas, which is infinite, the transformation might cause parts of the background that were originally off-screen to appear. For example, if the root element's background were repeating dots, and a transformation of ''scale(0.5)'' were specified on the root element, the dots would shrink to half their size, but there will be four times as many, so they still cover the whole viewport.
 
 
 The 'transform' Property {#transform-property}