Update release notes for release

Change-Id: I64ae4932098d5e50bcaaef4c6ba723b9c4e768f7

releasenotes/notes/bump-ansible-version-35c201d1d6d30860.yaml

@@ -1,4 +1,4 @@
 ---
 features:
-  - Bump to latest stable Ansible version (2.4)
+  - Now leverages stable Ansible version (2.4).
 

releasenotes/notes/create-openrc-9e7f959790f7f409.yaml

@@ -1,6 +1,6 @@
 ---
 features:
-  - The Bifrost role which is used to create a clouds.yaml, now also
+  - The bifrost role which is used to create a clouds.yaml, now also
     creates a openrc file in the user home directory when keystone
     is enabled. This should be used to call OpenStack CLI utilities
     and have proper credentials. The file location is ``~/openrc``.

releasenotes/notes/vm-host-cpu-type-support-a09768f360372506.yaml

@@ -1,7 +1,7 @@
 ---
 features:
-  - Add support for tweaking the vCPU model for the VMs created
-    by bifrost-create-vm-nodes. The default vCPU model is 'host-model'
+  - Adds support for tweaking the vCPU model for the VMs created
+    by bifrost-create-vm-nodes. The default vCPU model is ``host-model``
     which should provide the best possible performance whilst using only
     the CPU features which are understood by libvirt. The model can be
-    changed using the `test_vm_cpu` Ansible variable.
+    changed using the ``test_vm_cpu`` Ansible variable.

releasenotes/notes/vm-nic-type-support-0ac47ccd3d56132c.yaml

@@ -1,7 +1,7 @@
 ---
 features:
   - |
-    Add support for tweaking the vNIC model for the VMs created
-    by bifrost-create-vm-nodes. The default vNIC model is 'virtio'
+    Adds support for modifying the vNIC model for the VMs created
+    by bifrost-create-vm-nodes. The default vNIC model is ``virtio``
     which should provide the best possible performance. The model can be
-    changed using the `test_vm_nic` Ansible variable.
+    changed using the ``test_vm_nic`` Ansible variable.