Updated APIs for v0.14.0 release (#2391)

* Updated APIs for v0.14.0 release

* Update docs/reference/eventing/eventing-contrib.md

Co-Authored-By: Matt Moore <mattmoor@vmware.com>

* Updated faulty links.

* Update links in serving.md

* trying to fix samples link in GitLab

* Still trying the update

* Update docs/reference/eventing/eventing-contrib.md

Co-Authored-By: Matt Moore <mattmoor@vmware.com>

Co-authored-by: Matt Moore <mattmoor@vmware.com>