Bug 28463: Add summary to all routes

Bug 28463: Add summary to all routes

This patch adds a 'summary' entry to all routes and verbs. This way,
ReDoc will display a human-friendly description of the route, instead of
the operationId.

To test, repeat the testing steps in the previous patch, and notice that
we now have good descriptions.

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>