Fix spelling in comment

Created by: cvrebert

less/navs.less

@@ -59,7 +59,7 @@
     }
   }
 
-  // Redeclare pull classes because of specifity
+  // Redeclare pull classes because of specificity
   // Todo: consider making these utilities !important to avoid this bullshit
   > .pull-right {
     float: right;