Use Jekyll's smartify filter when possible. (#24866)

_layouts/docs.html

@@ -25,8 +25,8 @@
         {% endif %}
 
         <main class="col-12 col-md-9 col-xl-8 py-md-3 pl-md-5 bd-content" role="main">
-          <h1 class="bd-title" id="content">{{ page.title }}</h1>
-          <p class="bd-lead">{{ page.description }}</p>
+          <h1 class="bd-title" id="content">{{ page.title | smartify }}</h1>
+          <p class="bd-lead">{{ page.description | smartify }}</p>
           {% include ads.html %}
           {{ content }}
         </main>