[mediaqueries-5] Fix typos

See d7b7f4b#r48157412 and d7b7f4b#r48157409

Author: frivoal

mediaqueries-5/Overview.bs

@@ -2777,8 +2777,8 @@ Detecting Forced Colors Mode: the 'forced-colors' feature</h3>
 		''@media (forced-colors) or (prefers-contrast) { … }''
 		can thus be a useful query to conditionally apply styles that reduce visual clutter,
 		catching all users of forced colors and all users with contrast preferences.
-		''@media (prefers-contrast) { … }'' would leave how forced-colors users
-		with a color scheme that is neither particularly hight nor low contrast,
+		''@media (prefers-contrast) { … }'' would leave out forced-colors users
+		with a color scheme that is neither particularly high nor low contrast,
 		while ''@media (forced-colors) { … }'' would instead leave out users with contrast preferences
 		that do not come from usage of [=forced colors mode=].
 	</div>