Merge branch 'clarify-v3-end-date-undefined' into 'master'

v3 API is unsupported after 9.5, but may not be removed

See merge request !13074

doc/api/v3_to_v4.md

@@ -2,9 +2,11 @@
 
 Since GitLab 9.0, API V4 is the preferred version to be used.
 
-API V3 will be removed in GitLab 9.5, to be released on August 22, 2017. In the 
-meantime, we advise you to make any necessary changes to applications that use 
-V3. The V3 API documentation is still [available](https://gitlab.com/gitlab-org/gitlab-ce/blob/8-16-stable/doc/api/README.md).
+API V3 will be unsupported from GitLab 9.5, to be released on August
+22, 2017. It will be removed in GitLab 9.5 or later. In the meantime, we advise
+you to make any necessary changes to applications that use V3. The V3 API
+documentation is still
+[available](https://gitlab.com/gitlab-org/gitlab-ce/blob/8-16-stable/doc/api/README.md).
 
 Below are the changes made between V3 and V4.