DOC-5131 fixed missing quotes in <img> elements

Author: andy-stark-redis

layouts/shortcodes/dev-features.html

@@ -2,19 +2,19 @@
     <tr>
         <th>
             <a href='{{ relref . "/develop/get-started" }}'>
-                <img src={{ relURL "images/icon_logo/icon-developers-32-midnight.png" }}/>
+                <img src='{{ relURL "images/icon_logo/icon-developers-32-midnight.png" }}'/>
                 <strong>Quick start</strong>
             </a>
         </th>
         <th>
             <a href='{{ relref . "/develop/data-types" }}'>
-            <img src={{ relURL "images/icon_logo/icon-data-structures-32-midnight.png" }}/>
+            <img src='{{ relURL "images/icon_logo/icon-data-structures-32-midnight.png" }}'/>
             <strong>Data types</strong>
             </a>
         </th>
         <th>
             <a href='{{ relref . "/develop/interact/search-and-query" }}'>
-                <img src={{ relURL "images/icon_logo/icon-text-search-32-midnight.png" }}/>
+                <img src='{{ relURL "images/icon_logo/icon-text-search-32-midnight.png" }}'/>
                 <strong>Query engine</strong>
             </a>
         </th>