Editing Template:Documentation

<includeonly>
<!-- Simple Documentation Template (no Lua) -->

<!-- Try to include the /doc subpage if it exists -->
{{#ifexist:{{FULLPAGENAME}}/doc
 | <div style="border:1px solid #a2a9b1; background-color:#f8f9fa; padding:0.5em; margin-top:1em;">
   <strong>Template documentation</strong><br />
   {{{{FULLPAGENAME}}/doc}}
   </div>
 | <!-- No /doc page found -->
}}
</includeonly>
<noinclude>
This is a simple fallback for <code><nowiki>{{documentation}}</nowiki></code>.
It automatically shows the content of a <code>/doc</code> subpage if it exists.

Usage:
<pre><nowiki>{{documentation}}</nowiki></pre>

Create a subpage named <code>Template:YourTemplateName/doc</code> for the documentation text.
</noinclude>