fixes #10857 invisible span had width (#10860)

config/nimdoc.cfg

@@ -50,7 +50,7 @@ $seeSrc
 # See doc.item for available substitution variables.
 doc.item.toc = """
   <li><a class="reference" href="#$itemSymOrIDEnc"
-    title="$header_plain">$name<span class="attachedType" style="visibility:hidden">$attype</span></a></li>
+    title="$header_plain">$name<span class="attachedType">$attype</span></a></li>
 """
 
 # HTML rendered for doc.item's seeSrc variable. Note that this will render to
@@ -949,6 +949,10 @@ span.pragmawrap {
   display: none;
 }
 
+span.attachedType {
+  display: none;
+  visibility: hidden;
+}
 </style>
 
 <script type="text/javascript" src="dochack.js"></script>