DOC: typo: req.uri is now replaced by capture.req.uri

A configuration example was not updated after the switch from req.uri to
capture.req.uri.

backport: 1.5 and above
(cherry picked from commit c8f0e78b25287afd29627217bb67a7053af46518)
(cherry picked from commit 83f84932a1ba54dbab95081219f1bbc3925107c5)
1 file changed