Rollup merge of rust-lang#48789 - GuillaumeGomez:horizontal-scroll, r=QuietMisdreavus

Fix sidebar horizontal scroll

Just like @onur said.

r? @QuietMisdreavus

Author: Manishearth

src/librustdoc/html/static/rustdoc.css

@@ -183,7 +183,7 @@ nav.sub {
 }
 
 .sidebar .block > ul > li {
-	margin-right: -20px;
+	margin-right: -10px;
 }
 
 .content, nav {