Make links anonymous so that they don't trigger rstcheck

rstcheck flags duplicate link targets as errors

changelogs/fragments/fix-world-readable-skip-message.yaml

@@ -1,6 +1,6 @@
 ---
 bugfixes:
-- The fix for `CVE-2018-10875 <https://access.redhat.com/security/cve/cve-2018-10875>`_
+- The fix for `CVE-2018-10875 <https://access.redhat.com/security/cve/cve-2018-10875>`__
   prints out a warning message about skipping a config file from a world
   writable current working directory.  However, if the user explicitly
   specifies that the config file should be used via the ANSIBLE_CONFIG

changelogs/fragments/more-world-readable-warning-skips.yaml

@@ -1,6 +1,6 @@
 ---
 bugfixes:
-- The fix for `CVE-2018-10875 <https://access.redhat.com/security/cve/cve-2018-10875>`_
+- The fix for `CVE-2018-10875 <https://access.redhat.com/security/cve/cve-2018-10875>`__
   prints out a warning message about skipping a config file from a world
   writable current working directory.  However, if the user is in a world
   writable current working directory which does not contain a config file, it

changelogs/fragments/v2.7.0_summary.yaml

@@ -0,0 +1,4 @@
+---
+release_summary: |
+    | Release Date: 2018-10-04
+    | `Porting Guide <https://docs.ansible.com/ansible/devel/porting_guides.html>`__