On the 'moves-tracking-2' branch: Improve comments.

* subversion/include/private/svn_editor3.h,
  subversion/libsvn_delta/compat3.c
  Improve comments.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/move-tracking-2@1614710 13f79535-47bb-0310-9956-ffa450edef68
On the 'moves-tracking-2' branch: Fix a poorly defined macro.

* subversion/libsvn_delta/compat3.c
  (VERIFY): Remove a stray semicolon.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/move-tracking-2@1614712 13f79535-47bb-0310-9956-ffa450edef68