Fix typo in documentation.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4589 dfc29bdd-3216-0410-991c-e03cc46cb475
- Clean-up Android device source file.
- Improved multi-touch support on Android.
- Fixed problem with context lost on Android when application was resumed.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4590 dfc29bdd-3216-0410-991c-e03cc46cb475