[css-color-5][editorial] typo w3c#6833

Author: Chris Lilley

css-color-5/Overview.bs

@@ -390,7 +390,7 @@ must not be omitted.
 	This is a <em>huge</em> difference; the ΔE2000 between the correct and incorrect results is 30.7!
 </div>
 
-When the percentage ormalization gnerates an alpha multiplier,
+When the percentage normalization gerates an alpha multiplier,
 the calculation is the same except for an additional last step.
 
 <div class="example" id="ex-premultiply-srgb-2">