[mediaqueries-5] Spell check.

Author: dbaron

mediaqueries-5/Overview.bs

@@ -315,7 +315,7 @@ Detecting the ambient light level: the 'light-level' feature</h3>
 			<li>
 				Devices equipped with a light sensor usually adjust the brightness of the screen automatically.
 				Depending on the level of adjustment,
-				the thresholds for needing a low contrast or hight contrast content may vary.
+				the thresholds for needing a low contrast or high contrast content may vary.
 
 			<li>
 				Different screen technologies wash out at very different ambient light levels;
@@ -812,7 +812,7 @@ Detecting the desire for increased or decreased color contrast from elements on
 	</dl>
 
 	ISSUE(2943): Split ''prefers-contrast/high'' into two levels,
-	“extremely high” (as used in MSFT's black-on-white high conrast theme)
+	“extremely high” (as used in MSFT's black-on-white high contrast theme)
 	and “increased (as implemented in Apple's Increased Contrast settings)?
 
 <h3 id="prefers-color-scheme">