minor modification

Author: jwshinjwshin

src/lib/sidenav/sidenav.md

@@ -18,8 +18,7 @@ A sidenav container may contain one or two `<md-sidenav>` elements. When there a
 `<md-sidenav>` elements, each must be placed on a different side of the container.
 See the section on positioning below.
 
-
-### Sidenav vs. Drawer
+`<md-drawer>` is a component that is similar to `<md-sidenav>`. 
 The difference between sidenav and drawer is that the sidenav takes up fullscreen whereas drawer is a smaller element
 that takes up a subsection of the screen. `md-sidenav` has to be placed inside `md-sidenav-container` and `md-drawer`
 has to be placed inside `md-drawer-container`. Currently `md-drawer` and `md-sidenav` support all the same features.