Fixed typo

public/app/features/plugins/partials/ds_http_settings.html

@@ -14,11 +14,11 @@
           <p>Specify a complete HTTP url (for example http://your_server:8080)</p>
           <span ng-show="current.access === 'direct'">
             Your access method is <em>Direct</em>, this means the url
-            needs to be accessable from the browser.
+            needs to be accessible from the browser.
           </span>
           <span ng-show="current.access === 'proxy'">
             Your access method is currently <em>Proxy</em>, this means the url
-            needs to be accessable from the grafana backend.
+            needs to be accessible from the grafana backend.
           </span>
         </info-popover>
       </div>