Unclear documentation in

The example has the following text [1]

"""
# (*) Actually, each path will select just one group. Thus, it is possible
# that one group will match against all paths, while another group matches
# none of the paths, even though its for_paths would have selected some of
# the paths in the commit.
"""

It's not clear what this means.
AFAICT, multiple groups *can* match a single path.
But maybe it means something else?

Sebb
[1] https://github.com/apache/subversion/blob/91748f254bd2710f9df04b765d11276ab7c10ce4/tools/hook-scripts/mailer/mailer.conf.example#L70-L73