add letter L at word Horizontal the menu

simple error but orthography bad

Author: Felipe Souza

README.md

@@ -23,7 +23,7 @@ A collection of [SASS](http://sass-lang.com/ "SASS") mixins for your project.
     * [Rotate](#rotate)
     * [Transform-origin](#transform-origin)
 * [Gradients](#gradients)
-    * [Linear Horizonta (simple)](#linear-horizontal-simple)
+    * [Linear Horizontal (simple)](#linear-horizontal-simple)
     * [Linear Horizontal (multiple)](#linear-horizontal-multiple)
     * [Linear Vertical (simple)](#linear-vertical-simple)
     * [Linear Vertical (multiple)](#linear-vertical-multiple)
@@ -186,4 +186,4 @@ The first color is the background color and the other are steps of gradient.
 
 ```scss
 .class { @include font-face("helvetica","../font/helvetica"); }
-```
+```