Fix docs reqs for new pip

Per [1], the docs requirements were failing (or at least could) due to
test-requirements being used instead of doc/requirements. The former
may include dep versions not compatible with the upper-constraints and
hence cause issues for the new pip resolver. This patch fixes that.

[1] http://lists.openstack.org/pipermail/openstack-discuss/2021-January/019611.html

Change-Id: Ifcf59e49b00e9b468b59f53de53c417a0e84adc4
Signed-off-by: Nicolas Bock <nicolas.bock@canonical.com>
diff --git a/releasenotes/source/index.rst b/releasenotes/source/index.rst
new file mode 100644
index 0000000..cf4c77e
--- /dev/null
+++ b/releasenotes/source/index.rst
@@ -0,0 +1,18 @@
+..
+      Licensed under the Apache License, Version 2.0 (the "License"); you may
+      not use this file except in compliance with the License. You may obtain
+      a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+      Unless required by applicable law or agreed to in writing, software
+      distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+      WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+      License for the specific language governing permissions and limitations
+      under the License.
+
+======================================
+Designate Tempest Plugin Release Notes
+======================================
+
+.. release-notes::