Minimize crates.io link text

Author: GuillaumeGomez

templates/rustdoc/topbar.html

@@ -92,7 +92,7 @@
 
                             <li class="pure-menu-item">
                                 <a href="https://crates.io/crates/{{ krate.name }}" class="pure-menu-link" title="See {{ krate.name }} in crates.io">
-                                    {{ "cube"|fas(false, false, "") }} Crates.io
+                                    {{ "cube"|fas(false, false, "") }} crates.io
                                 </a>
                             </li>