Reduce margin on h5 and h6

Author: jsha

src/librustdoc/html/static/css/rustdoc.css

@@ -129,9 +129,14 @@ h3 {
 }
 h1, h2, h3, h4, h5, h6 {
 	font-weight: 500;
+}
+h1, h2, h3, h4 {
 	margin: 20px 0 15px 0;
 	padding-bottom: 6px;
 }
+h5, h6 {
+	margin: 15px 0 5px 0;
+}
 h1.fqn {
 	display: flex;
 	border-bottom: 1px dashed;
@@ -505,7 +510,9 @@ nav.sub {
 .top-doc .docblock h2 { font-size: 1.3em; }
 .top-doc .docblock h3 { font-size: 1.15em; }
 .top-doc .docblock h4,
-.top-doc .docblock h5,
+.top-doc .docblock h5 {
+	font-size: 1.1em;
+}
 .top-doc .docblock h6 {
 	font-size: 1em;
 }