Missing library for Qt5 install on linux in documentation

[andyjaramillo]

Documentation proposed change

When setting up cgal locally, i noticed that i was missing qt5, but I had qt5 installed and all the paths were defined when checking in the cmake-gui. I knew it could not find qt5 when running the Triangulation_2 example code but it said it could not find the package.

Running

    sudo apt-get install libcgal-qt5-dev

was the fix, but i did not see that on the documentation anywhere. I just wanted to add this to the docs so others dont run into the same issue.

Source Code

Documentation/doc/Documentation/Usage.txt

Environment

Operating system : Linux WSL2 Ubuntu 24.04.1 LTS
Compiler: GCC 13.3.0
Release or debug mode: debug mode
CGAL version: 5.6, 6.0, master
Boost version: 1.83.0.1