Make rustdoc headings black, and markdown blue

src/librustdoc/html/render/print_item.rs

@@ -296,7 +296,7 @@ fn item_module(w: &mut Buffer, cx: &Context<'_>, item: &clean::Item, items: &[cl
             let (short, name) = item_ty_to_strs(myty.unwrap());
             write!(
                 w,
-                "<h2 id=\"{id}\" class=\"section-header\">\
+                "<h2 id=\"{id}\" class=\"small-section-header\">\
                     <a href=\"#{id}\">{name}</a>\
                  </h2>\n{}",
                 ITEM_TABLE_OPEN,

src/librustdoc/html/static/css/themes/ayu.css

@@ -219,7 +219,7 @@ a {
 a.srclink,
 a#toggle-all-docs,
 a.anchor,
-.section-header a,
+.small-section-header a,
 #source-sidebar a,
 pre.rust a,
 .sidebar a,

src/librustdoc/html/static/css/themes/dark.css

@@ -181,7 +181,7 @@ a {
 a.srclink,
 a#toggle-all-docs,
 a.anchor,
-.section-header a,
+.small-section-header a,
 #source-sidebar a,
 pre.rust a,
 .sidebar a,

src/librustdoc/html/static/css/themes/light.css

@@ -176,7 +176,7 @@ a {
 a.srclink,
 a#toggle-all-docs,
 a.anchor,
-.section-header a,
+.small-section-header a,
 #source-sidebar a,
 pre.rust a,
 .sidebar a,