Fixed migration guide link

docs/manual/introduction/Migration-guide.html

@@ -14,7 +14,7 @@
 			The migration guide is maintained on the [link:https://github.com/mrdoob/three.js/wiki wiki].
 			It contains a list of changes for each version of three.js going back to r45.<br /><br />
 
-			You can find it [link:https://github.com/mrdoob/three.js/wiki/Migration here].
+			You can find it [link:https://github.com/mrdoob/three.js/wiki/Migration-Guide here].
 		</div>
 	</body>
 </html>