Fix up formatting for deprecate-api-extensions-policies release note

Fix the indention and remove the single quotes which don't format to
anything useful.

Change-Id: I16197da657aedda6e927352b5c4ae82b653acfc8

releasenotes/notes/deprecate-api-extensions-policies-5613bc4eea59709d.yaml

@@ -4,23 +4,23 @@ deprecations:
     Nova API extension concept is removed in Pike. These extensions
     have their own policies enforcement which are not needed any more.
     All the below policies which were added mainly for extensions are
-    deprecated for removal-
+    deprecated for removal:
 
     - Show & List detail server
 
-        - 'os_compute_api:os-config-drive'
-        - 'os_compute_api:os-extended-availability-zone'
-        - 'os_compute_api:os-extended-status'
-        - 'os_compute_api:os-extended-volumes'
-        - 'os_compute_api:os-keypairs'
-        - 'os_compute_api:os-server-usage'
-        - 'os_compute_api:os-security-groups' (only from /servers APIs)
+      - os_compute_api:os-config-drive
+      - os_compute_api:os-extended-availability-zone
+      - os_compute_api:os-extended-status
+      - os_compute_api:os-extended-volumes
+      - os_compute_api:os-keypairs
+      - os_compute_api:os-server-usage
+      - os_compute_api:os-security-groups (only from /servers APIs)
 
     - Create, Update, Show & List detail flavor
 
-        - 'os_compute_api:os-flavor-rxtx'
-        - 'os_compute_api:os-flavor-access' (only from /flavors APIs)
+      - os_compute_api:os-flavor-rxtx
+      - os_compute_api:os-flavor-access (only from /flavors APIs)
 
     - Show & List detail image
 
-        - 'os_compute_api:image-size'
+      - os_compute_api:image-size