Update PerspectiveCamera.html

docs/api/cameras/PerspectiveCamera.html

@@ -50,7 +50,7 @@ scene.add( camera );</code>
 		<h2>Properties</h2>
 		<p>
 			See the base [page:Camera] class for common properties.<br>
-			Note that after making changes to most of these poperties you will have to call
+			Note that after making changes to most of these properties you will have to call
 			[page:PerspectiveCamera.updateProjectionMatrix .updateProjectionMatrix] for the changes to take effect.
 		</p>