Fix minor issue in 'using screen capture api' article (#2916)

files/en-us/web/api/screen_capture_api/using_screen_capture/index.html

@@ -68,7 +68,7 @@ <h2 id="Capturing_screen_contents">Capturing screen contents</h2>
 
 <h3 id="Visible_vs_logical_display_surfaces">Visible vs logical display surfaces</h3>
 
-<p>For the purposes of the Screen Capture API, a <strong>display surface</strong> is any content object that can be selected by the API for sharing purposes. Sharing surfaces include the contents of a browser tab, a complete window, all of the applications of a window combined into a single surface, and a monitor (or group of monitors combined together into one surface).</p>
+<p>For the purposes of the Screen Capture API, a <strong>display surface</strong> is any content object that can be selected by the API for sharing purposes. Sharing surfaces include the contents of a browser tab, a complete window, all of the windows of an application combined into a single surface, and a monitor (or group of monitors combined together into one surface).</p>
 
 <p>There are two types of display surface. A <strong>visible display surface</strong> is a surface which is entirely visible on the screen, such as the frontmost window or tab, or the entire screen.</p>