Improve testing facility documentation

The documentation at https://murex.rocks/docs/commands/test.html

Is making hard to do https://github.com/ngs-lang/ngs/issues/494 ("Scan Murex test facility for ideas")

This also came up in https://github.com/lmorg/murex/issues/389