fix levels in authors section

that way in the TOC, it doesn't look like borg authors are attic

AUTHORS

@@ -1,5 +1,5 @@
-Borg Contributors ("The Borg Collective")
-=========================================
+Borg authors ("The Borg Collective")
+------------------------------------
 
 - Thomas Waldmann <tw@waldmann-edv.de>
 - Antoine Beaupré <anarcat@debian.org>

docs/authors.rst

@@ -1,5 +1,8 @@
 .. include:: global.rst.inc
 
+Authors
+=======
+
 .. include:: ../AUTHORS
 
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