point operations-puppet-doc to git:// url

The operations-puppet-doc was still pointing to /srv/ssd/zuul/git. A
side effect is that it was no more able to fetch submodules because the
Jenkins git plugin rewrite the submodule URL (bug 42953).

bug: 42953
Change-Id: I2dc0ad5fcb51d7720475eae70f91466a78a0fe2e