BUG: config: error in http-response replace-header number of arguments

A couple of typo fixed in 'http-response replace-header':
- an error when counting the number of arguments
- a typo in the alert message

This should be backported to 1.5.
(cherry picked from commit 12cb00b216d67468b7c4bd84abedcb4ecd1a32bc)
1 file changed