doc change: fix typo

Change-Id: Ib0e21fb53d3986ebb9f76dadc291ce9dfa42adf7

Author: ddougherty

docs/html/sdk/android-3.2.jd

@@ -166,7 +166,7 @@ in which the application UI will need to be drawn, not including screen areas
 reserved by the system.
 </li>
 
-<li>In constrast, a screen's <em>width</em> and <em>height</em> represent the
+<li>In contrast, a screen's <em>width</em> and <em>height</em> represent the
 current horizontal or vertical space available for application layout, measured
 in "dp" units, not including screen areas reserved by the system. The width and
 height of a screen change when the user switches orientation between landscape