SOLR-12746: Fix formatting for callout list numbers and preamble sections

solr/solr-ref-guide/src/_templates/colist.html.slim

@@ -1,4 +1,8 @@
-/ Note: We ignore title on callout list here.
-ol.callout-list id=id class=[style, role]
-  - items.each do |item|
-    li =item.text
+= block_with_title class: ['colist', style]
+  table
+    - items.to_enum.with_index 1 do |item, num|
+      tr
+        td
+          i.conum data-value=num
+          b =num
+        td =item.text

solr/solr-ref-guide/src/css/ref-guide.css

@@ -433,9 +433,11 @@ select
     width: 100%;
 }
 
+/* Defines size and line height for "lead" type sections, the first sentence of a page. */
 #preamble > .sectionbody > .paragraph:first-of-type p,
 .paragraph.lead > p,
-p.lead
+p.lead,
+#preamble > p:first-of-type
 {
     font-size: 1.21875em;
     line-height: 1.6;
@@ -1454,8 +1456,10 @@ table.tableblock > caption.title
     white-space: nowrap;
 }
 
+/* Defines color for "lead" type sections, the first text on a page. */
 #preamble > .sectionbody > .paragraph:first-of-type p,
-.paragraph.lead > p
+.paragraph.lead > p,
+#preamble > p:first-of-type
 {
     color: rgba(0,0,0,.85);
 }