The sentense marked with a red under line in the image below is misleading in a way that it gives the reader an impression of Coco only working for the desktop apps, which I believe is not true.

In my opinion, this is clearer;
"Coco is a complete code coverage tool chain for Tcl, QML, C# and C/C++ programs, which runs on macOS, Linux, and Windows."

Given "run*s"* using the third person singular, the reader might be able to assume its subject is Coco, not "Tcl, QML, C# and C/C++ programs."

However, it's also true that it confused me a bit at first and there are some grammatical mistakes here and there in overall Qt document, more clarity better exists than it doesn't.