Merge pull request #8616 from caouecs/patch-1

Small typo in less/mixins.less

less/mixins.less

@@ -353,7 +353,7 @@
   }
 }
 
-// Button psuedo states
+// Button pseudo states
 // -------------------------
 // Easily pump out default styles, as well as :hover, :focus, :active,
 // and disabled options for all buttons