[css-transforms-2] Spell check.

Author: dbaron

css-transforms-2/Overview.bs

@@ -1452,7 +1452,7 @@ One translation unit on a matrix is equivalent to 1 pixel in the local coordinat
 
 			$$\begin{bmatrix} 1 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & -1/d & 1 \end{bmatrix}$$
 
-			If the parameter <var>d</var> is ''perpective()/none'' it is treated as infinity
+			If the parameter <var>d</var> is ''perspective()/none'' it is treated as infinity
 			(and the resulting matrix is the identity matrix).
 
 </ul>