Fix/divide (#3362)

* Use custom divide function

* Add docs spacing table styles

* Update changelog

docs/documentation/helpers/spacing-helpers.html

@@ -27,6 +27,7 @@ values:
   4: 1rem
   5: 1.5rem
   6: 3rem
+  auto: auto
 customShortcuts:
   margin: mg
 customHorizontal: h
@@ -96,7 +97,7 @@ customValues:
 {% include elements/anchor.html name="List of all spacing helpers" %}
 
 <p class="block">
-  There are <strong>98 spacing helpers</strong> to choose from:
+  There are <strong>112 spacing helpers</strong> to choose from:
 </p>
 
 {% include
@@ -180,5 +181,5 @@ $spacing-values: ("small": 10px, "medium": 30px, "large": 60px);
 %}
 
 <p>
-  By customizing the output, you've narrowed down the list of spacing helpers from 98 to only <strong>18</strong>.
+  By customizing the output, you've narrowed down the list of spacing helpers from 112 to only <strong>18</strong>.
 </p>