Fix secret for promote-tox-docs-special-base
Fix secret for promote-tox-docs-special-base

The secret was misnamed, fix it so that it matches
promote-tox-docs-special-base.

Change-Id: I8c16536531e689cbe09163eadcb570f8d05e306e

openstack-infra/project-config,openstack-infra/project-config