Reformat the docs in systeminfo.cpp as C++ code docs.
Edit for style.
Change-Id: Idec8aaae072a97f889b4d48051341ff766da4247
Reviewed-by: Niels Weber <niels.weber@theqtcompany.com>
Reviewed-by: Karsten Heimrich <karsten.heimrich@theqtcompany.com>
Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>