Changes
br + span = div; do show the template at its own page (so that also the noinclude bit in the category makes sense)
<includeonly><!-- only show on documentation subpages -->{{#ifeq:{{lc:{{SUBPAGENAME}}}}|{{{override|doc}}}|</includeonly><div class="messagebox" id="template_doc_page_viewed_directly" style="text-align: center">This subpage contains [[Wikipedia:Template documentation|documentation]], [[Wikipedia:Categories|categories]] and other content that is not part of the template. <br/> <span div style="font-size: 88%">To view the {{lc:{{NAMESPACE}}}} page itself, see {{{1|[[{{SUBJECTSPACE}}:{{BASEPAGENAME}}]]}}}.</spandiv></div>
{{DEFAULTSORT:{{PAGENAME}}}}{{#if:{{{inhibit|}}}|<!-- skip -->|[[Category:Documentation subpages<noinclude>| </noinclude>]]}}
<includeonly>}}</includeonly><noinclude>
{{documentation}}
<!-- Add categories and interwikis to the /doc subpage, not here! -->
</noinclude>