Minor grammar fix

index.html

@@ -133,7 +133,7 @@ <h3><span lang="en">Legend</span><span lang="ru">Как этим пользов
                             <dt><img src="reach.png"></dt>
                                 <dd>Show reachable area: you can still reach those points from
                                 the current position and altitude. Points outside this area are no
-                                longer reachable no matter which inputs are given to the canopy.</dd>
+                                longer reachable no matter what inputs are given to the canopy.</dd>
                         </dl>
                         <p>Press P to pause/unpause: the time stops, but you still can turn your canopy in place to discover its range and possibilities.</p>
                         <p>Read more about the tool <a href="about.html">here</a>.</p>