Rollup merge of rust-lang#53747 - GuillaumeGomez:rustdoc-fixes, r=QuietMisdreavus

Rustdoc fixes

Fixes rustdoc not scrolling to given lines and invalid unstable display:

<img width="1440" alt="screen shot 2018-08-27 at 23 28 47" src="https://user-images.githubusercontent.com/3050060/44687252-06535e80-aa51-11e8-8512-d7d34d1cb963.png">

r? @QuietMisdreavus

Author: kennytm

src/librustdoc/html/static/main.js

@@ -242,6 +242,7 @@
         }
     }
 
+    highlightSourceLines(null);
     window.onhashchange = highlightSourceLines;
 
     // Gets the human-readable string for the virtual-key code of the

src/librustdoc/html/static/rustdoc.css

@@ -502,6 +502,7 @@ h4 > code, h3 > code, .invisible > code {
 	margin-left: 33px;
 	margin-top: -13px;
 }
+
 .content .stability::before {
 	content: '˪';
 	font-size: 30px;
@@ -510,6 +511,10 @@ h4 > code, h3 > code, .invisible > code {
 	left: -13px;
 }
 
+#main > .stability {
+	margin-top: 0;
+}
+
 nav {
 	border-bottom: 1px solid;
 	padding-bottom: 10px;