[css-color-5] Fix w3c#6856

Author: svgeesus

css-color-5/Overview.bs

@@ -271,8 +271,8 @@ The choice of mixing colorspace can have a large effect on the end result.
 	</pre>
 
 	The calculation is as follows:
-		* sRGB  <span class="swatch" style="--color: white"></span> white (#008080) is lch(100% 0 0)
-		* sRGB <span class="swatch" style="--color: black"></span>  black (#808000) is lch(0% 0 0)
+		* sRGB  <span class="swatch" style="--color: white"></span> white (#FFF) is lch(100% 0 0)
+		* sRGB <span class="swatch" style="--color: black"></span>  black (#000) is lch(0% 0 0)
 		* The mix in LCH is <span class="swatch" style="--color: rgb(47% 47% 47%)"></span>  lch(50% 0 0)
 		* The mix in XYZ is <span class="swatch" style="--color: rgb(74% 74% 74%)"></span>  lch(76% 0 0)
 		* The mix in sRGB is <span class="swatch" style="--color: rgb(50% 50% 50%)"></span>  lch(53.4% 0 0)