Remove trailing whitespaces (#1505)

docs/documentation/overview/variables.html

@@ -13,7 +13,7 @@ doc-subtab: variables
     <h2 class="subtitle">Easily <strong>customize</strong> Bulma to match your design</h2>
 
     <hr>
-    
+
     {% assign initial_variables = site.data.variables.utilities.initial-variables %}
     {% assign initial_vars      = initial_variables.vars %}
     {% assign derived_variables = site.data.variables.utilities.derived-variables %}
@@ -93,7 +93,7 @@ doc-subtab: variables
       {% endfor %}
       <tbody>
     </table>
-    
+
     {% capture custom_message %}
       These are <a href="{{ derived_variables.file_url }}" target="_blank">variables</a> with a value that <strong>references</strong> another variable.
     {% endcapture %}
@@ -104,7 +104,7 @@ doc-subtab: variables
         custom_message = custom_message
         table_class    = 'is-bordered is-striped'
     %}
-    
+
     {% capture custom_message %}
       You can use the following <a href="{{ site.data.variables.base.generic.file_url }}" target="_blank">generic variables</a> for general <strong>customization</strong>. Simply set one or multiple of these variables <em>before</em> importing Bulma. <a href="{{ site.url }}/documentation/overview/customize/">Learn how</a>.
     {% endcapture %}
@@ -116,6 +116,6 @@ doc-subtab: variables
         custom_message = custom_message
         table_class    = 'is-bordered is-striped'
     %}
-    
+
   </div>
 </section>