[gtk-doc/gtk-doc-for-gtk4] Support sub-heading in tables

[Matthias Clasen <matthiasc src gnome org>]

commit 5dfdb508f5362cefeea5381562fdb62724e47286
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Apr 18 12:25:16 2020 -0400

    Support sub-heading in tables
    
    It is a tragedy that docbook has this incredibly elaborate
    language for formatting all sorts of things, yet, style sheets
    have to resort to processing instructions to do the most basic
    table formatting things, like allowing subheadings. Truly
    tragic.
    
    So, to mark a table row as subheading (to receive the same
    basic formatting as a <thead><row>), add
    <?dbhtml class="subhead"?> to the row.
    
    This commit changes style.css to apply the heading style
    to such rows.

 style/style.css | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/style/style.css b/style/style.css
index 6f0bc25..2efd5a9 100644
--- a/style/style.css
+++ b/style/style.css
@@ -143,6 +143,13 @@ div.table table td, div.table table th
   vertical-align: top;
 }
 
+div.table table tr.subhead
+{
+  /* tango:aluminium 2 */
+  background-color: #d3d7cf;
+  font-weight: bold;
+}
+
 div.table table th
 {
   /* tango:aluminium 2 */