docs fixes

docs/weeks/11/11_1.tex

docs/weeks/11/11_3.tex

docs/weeks/11/11_4.tex

docs/weeks/11/screenshot.png

src/projlab/Asteroid.java

src/projlab/AsteroidObserver.java

src/projlab/Game.java

src/projlab/GameObserver.java

src/projlab/MainPanel.java

src/projlab/Portal.java

src/projlab/PortalObserver.java

src/projlab/Settler.java

src/projlab/SettlerControlPanel.java

src/projlab/SettlerInfoPanel.java

src/projlab/SettlerObserver.java