Remove trailing whitespaces (#1505)

docs/documentation/overview/responsiveness.html

@@ -33,7 +33,7 @@ variables_keys:
     </div>
 
     {% include anchor.html name="Breakpoints" %}
-    
+
     {% assign variables_file_url = "/blob/master/sass/utilities/initial-variables.sass#L46,L57" | prepend: site.github %}
     {% assign mixins_file_url = "/blob/master/sass/utilities/mixins.sass#L182,L226" | prepend: site.github %}
 
@@ -45,7 +45,7 @@ variables_keys:
           <li>{% if breakpoint.id == 'fullhd' %}<span class="tag is-success">New!</span> {% endif %}<code>{{ breakpoint.id }}</code>: {% if breakpoint.id == 'mobile' %}up to <code>{{ breakpoint.to }}px</code>{% else %}from <code>{{ breakpoint.from }}px</code>{% endif %}</li>
         {% endfor %}
       </ul>
-      
+
       <p>Bulma uses <a href="{{ mixins_file_url }}" target="_blank">9 responsive mixins</a>:</p>
       <ul>
         {% for breakpoint_hash in site.data.breakpoints %}
@@ -184,7 +184,7 @@ variables_keys:
         </tr>
       </tbody>
     </table>
-    
+
     {% include anchor.html name="Variables" %}
 
     <div class="content">
@@ -220,6 +220,6 @@ variables_keys:
         {% endfor %}
       </tbody>
     </table>
-    
+
   </div>
 </section>