Update AUTHORS list, add commentary

Reviewed-by: NPaul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/6602)

AUTHORS

-    Andy Polyakov
-    Ben Laurie
-    Bodo Mller
-    Emilia Ksper
-    Eric Young
-    Geoff Thorpe
-    Holger Reif
-    Kurt Roeckx
-    Lutz Jnicke
-    Mark J. Cox
-    Matt Caswell
-    Nils Larsch
-    Paul C. Sutton
-    Ralf S. Engelschall
-    Rich Salz
-    Richard Levitte
-    Stephen Henson
-    Steve Marquess
-    Tim Hudson
-    Ulf Mller
-    Viktor Dukhovni
+# This is the list of OpenSSL authors for copyright purposes.
+#
+# This does not necessarily list everyone who has contributed code, since in
+# some cases, their employer may be the copyright holder.  To see the full list
+# of contributors, see the revision history in source control.
+OpenSSL Software Services, Inc.
+OpenSSL Software Foundation, Inc.
+
+# Individuals
+Andy Polyakov
+Ben Laurie
+Ben Kaduk
+Bernd Edlinger
+Bodo Möller
+David Benjamin
+Emilia Käsper
+Eric Young
+Geoff Thorpe
+Holger Reif
+Kurt Roeckx
+Lutz Jänicke
+Mark J. Cox
+Matt Caswell
+Matthias St. Pierre
+Nils Larsch
+Paul Dale
+Paul C. Sutton
+Ralf S. Engelschall
+Rich Salz
+Richard Levitte
+Stephen Henson
+Steve Marquess
+Tim Hudson
+Ulf Möller
+Viktor Dukhovni