Corrected a small error in the documentation

customize.html

@@ -1056,7 +1056,7 @@ base_url: "../"
         <p class="help-block">Hovered dropdown menu entry text color</p>
         <label>@dropdown-link-hover-bg</label>
         <input type="text" class="form-control" placeholder="#f5f5f5" data-var="@dropdown-link-hover-bg">
-        <p class="help-block">Hovered dropdown menu entry text color</p>
+        <p class="help-block">Hovered dropdown menu entry background color</p>
 
         <label>@dropdown-link-active-color</label>
         <input type="text" class="form-control" placeholder="@component-active-color" data-var="@dropdown-link-active-color">