typo fix

Author: Trott

docs/api/themes.html

@@ -43,7 +43,7 @@ <h2>ThemeRoller</h2>
 
 		<h2>Themes &amp; swatches</h2>
 
-		<p>The theme system is separates color and texture from structural styles that define things like padding and dimensions. This allows theme colors and textures to be defined once in the stylesheet and to be mixed, matched, and combined to achieve a wide range of visual effects. </p>
+		<p>The theme system separates color and texture from structural styles that define things like padding and dimensions. This allows theme colors and textures to be defined once in the stylesheet and to be mixed, matched, and combined to achieve a wide range of visual effects. </p>
 
 		<p>Each theme includes several global settings, including font family, drop shadows for overlays, and corner radius values for buttons and boxes. In addition, the theme can include multiple color swatches, each with color values for bars, content blocks, buttons and list items, and font <code>text-shadow</code>. </p>