Update AUTHORS list, add commentary

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

AUTHORS

@@ -1,21 +1,35 @@
-    Andy Polyakov
+# This is the list of OpenSSL authors for copyright purposes.
-    Ben Laurie
+#
-    Bodo Möller
+# This does not necessarily list everyone who has contributed code, since in
-    Emilia Käsper
+# some cases, their employer may be the copyright holder.  To see the full list
-    Eric Young
+# of contributors, see the revision history in source control.
-    Geoff Thorpe
+OpenSSL Software Services, Inc.
-    Holger Reif
+OpenSSL Software Foundation, Inc.
-    Kurt Roeckx
+
-    Lutz Jänicke
+# Individuals
-    Mark J. Cox
+Andy Polyakov
-    Matt Caswell
+Ben Laurie
-    Nils Larsch
+Ben Kaduk
-    Paul C. Sutton
+Bernd Edlinger
-    Ralf S. Engelschall
+Bodo Möller
-    Rich Salz
+David Benjamin
-    Richard Levitte
+Emilia Käsper
-    Stephen Henson
+Eric Young
-    Steve Marquess
+Geoff Thorpe
-    Tim Hudson
+Holger Reif
-    Ulf Möller
+Kurt Roeckx
-    Viktor Dukhovni
+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