[css-images] Whoops, swapped log base and arg.

Author: tabatkins

css-images/Overview.bs

@@ -1843,7 +1843,7 @@ Gradient Color-Stops</h3>
 
 		<li>
 			Let <var>C</var>, the color weighting at that point,
-			be equal to <code>P<sup>log<sub>.5</sub>(H)</sup></code>.
+			be equal to <code>P<sup>log<sub>H</sub>(.5)</sup></code>.
 
 		<li>
 			The color at that point is then a linear blend between the colors of the two <a>color stops</a>,

css-images/Overview.html

@@ -1926,7 +1926,7 @@ <h3 class="heading settled heading" data-level=4.5 id=color-stop-syntax><span cl
 
 		<li>
 			Let <var>C</var>, the color weighting at that point,
-			be equal to <code>P<sup>log<sub>.5</sub>(H)</sup></code>.
+			be equal to <code>P<sup>log<sub>H</sub>(.5)</sup></code>.
 
 		<li>
 			The color at that point is then a linear blend between the colors of the two <a data-link-type=dfn href=#color-stop title="color stops">color stops</a>,