Fix broken link in 2.7 release notes

Change-Id: I64ccf7d9795b55040670815688261e4cb35b2e41
Merge branch 'stable-2.7' into stable-2.8

* stable-2.7:
  Fix broken link in 2.7 release notes

Change-Id: Iaf92b8ea36f3b2d24aa4a9f8a793d1f09ebea23c