Bug 19221: Onboarding tool says user needs to be made superlibrarian

Bug 19221: Onboarding tool says user needs to be made superlibrarian

I changed the "To give new patron superlibrarian permissions go to:"
message to "To edit patron permissions, go to:". Please clarify if this
is clearer or not.

Test plan:
1) Apply patch
2) Go through the web installer
3) At the create koha administrator patron step, notice that at the
   bottom, there is a message saying "To edit patron permissions, go
   to:"

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>