Update index.html (#2951)

dialogue -> dialog

files/en-us/learn/accessibility/what_is_accessibility/index.html

@@ -151,7 +151,7 @@ <h2 id="Implementing_accessibility_into_your_project">Implementing accessibility
 
 <p>On the other hand, if you are working on a gallery website showing interesting 3D art, it would be unreasonable to expect every piece of art to be perfectly accessible to visually impaired people, given that it is an entirely visual medium.</p>
 
-<p>To show that you care and have thought about accessibility, publish an accessibility statement on your site that details what your policy is toward accessibility, and what steps you have taken toward making the site accessible. If someone does notify you that your site has an accessibility problem, start a dialogue with them, be empathetic, and take reasonable steps to try to fix the problem.</p>
+<p>To show that you care and have thought about accessibility, publish an accessibility statement on your site that details what your policy is toward accessibility, and what steps you have taken toward making the site accessible. If someone does notify you that your site has an accessibility problem, start a dialog with them, be empathetic, and take reasonable steps to try to fix the problem.</p>
 
 <div class="note">
 <p><strong>Note</strong>: Our <a href="/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Accessibility">Handling common accessibility problems article</a> covers accessibility specifics that should be tested in more detail.</p>