Fix style

Author: GuillaumeGomez

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

@@ -1828,6 +1828,11 @@ details.toggle > summary:not(.hideme)::before {
 left:-24px;
 }
 
+details.implementors-toggle>summary:not(.hideme)::before {
+left:-34px;
+top:9px;
+}
+
 /* When a "hideme" summary is open and the "Expand description" or "Show
 	methods" text is hidden, we want the [-] toggle that remains to not
 	affect the layout of the items to its right. To do that, we use