[master] change markdown comment style for pandoc

HISTORY

-<!--- - Copyright (C) 2017 Internet Systems Consortium, Inc. ("ISC") - -
-This Source Code Form is subject to the terms of the Mozilla Public -
-License, v. 2.0. If a copy of the MPL was not distributed with this -
-file, You can obtain one at http://mozilla.org/MPL/2.0/. ---> ###
 Functional enhancements from prior major releases of BIND 9
 
 BIND 9.11

HISTORY.md

-<!---
+<!--
  - Copyright (C) 2017  Internet Systems Consortium, Inc. ("ISC")
  -
  - This Source Code Form is subject to the terms of the Mozilla Public
  - License, v. 2.0. If a copy of the MPL was not distributed with this
  - file, You can obtain one at http://mozilla.org/MPL/2.0/.
---->
+-->
 ### Functional enhancements from prior major releases of BIND 9
 
 #### BIND 9.11

OPTIONS

-<!--- - Copyright (C) 2017 Internet Systems Consortium, Inc. ("ISC") - -
-This Source Code Form is subject to the terms of the Mozilla Public -
-License, v. 2.0. If a copy of the MPL was not distributed with this -
-file, You can obtain one at http://mozilla.org/MPL/2.0/. ---> Setting the
-STD_CDEFINES environment variable before running configure can be used to
-enable certain compile-time options that are not explicitly defined in
-configure.
+Setting the STD_CDEFINES environment variable before running configure can
+be used to enable certain compile-time options that are not explicitly
+defined in configure.
 
 Some of these settings are:
 

OPTIONS.md

-<!---
+<!--
  - Copyright (C) 2017  Internet Systems Consortium, Inc. ("ISC")
  -
  - This Source Code Form is subject to the terms of the Mozilla Public
  - License, v. 2.0. If a copy of the MPL was not distributed with this
  - file, You can obtain one at http://mozilla.org/MPL/2.0/.
---->
+-->
 Setting the `STD_CDEFINES` environment variable before running `configure`
 can be used to enable certain compile-time options that are not explicitly
 defined in `configure`.

README

-<!--- - Copyright (C) 2017 Internet Systems Consortium, Inc. ("ISC") - -
-This Source Code Form is subject to the terms of the Mozilla Public -
-License, v. 2.0. If a copy of the MPL was not distributed with this -
-file, You can obtain one at http://mozilla.org/MPL/2.0/. ---> # BIND 9
+BIND 9
 
 Contents
 

README.md

-<!---
+<!--
  - Copyright (C) 2017  Internet Systems Consortium, Inc. ("ISC")
  -
  - This Source Code Form is subject to the terms of the Mozilla Public
  - License, v. 2.0. If a copy of the MPL was not distributed with this
  - file, You can obtain one at http://mozilla.org/MPL/2.0/.
---->
+-->
 # BIND 9
 
 ### Contents

doc/dev/contrib.md

-<!---
+<!--
  - Copyright (C) 2017  Internet Systems Consortium, Inc. ("ISC")
  -
  - This Source Code Form is subject to the terms of the Mozilla Public
  - License, v. 2.0. If a copy of the MPL was not distributed with this
  - file, You can obtain one at http://mozilla.org/MPL/2.0/.
---->
+-->
 ## BIND Source Access and Contributor Guidelines
 *Apr 14, 2017*
 

doc/dev/dev.md

-<!---
+<!--
  - Copyright (C) 2017  Internet Systems Consortium, Inc. ("ISC")
  -
  - This Source Code Form is subject to the terms of the Mozilla Public
  - License, v. 2.0. If a copy of the MPL was not distributed with this
  - file, You can obtain one at http://mozilla.org/MPL/2.0/.
---->
+-->
 ## BIND Developer Information
 
 ### Contents

doc/dev/style.md

-<!---
+<!--
  - Copyright (C) 2017  Internet Systems Consortium, Inc. ("ISC")
  -
  - This Source Code Form is subject to the terms of the Mozilla Public
  - License, v. 2.0. If a copy of the MPL was not distributed with this
  - file, You can obtain one at http://mozilla.org/MPL/2.0/.
---->
+-->
 ## BIND 9 Coding Style
 
 BIND 9 is principally written in [C](#cstyle), with some additional code

util/update_copyrights

@@ -208,9 +208,9 @@ foreach $file (keys %file_types) {
                 $end_comment = "-->\n";
         } elsif ($type eq "MKD") {
                 $mkd_comment = 1;
-                $start_comment = "<!---\n";
+                $start_comment = "<!--\n";
                 $prefix = " - ";
-                $end_comment = "--->";
+                $end_comment = "-->";
         } elsif ($type eq "TXT") {
                 $prefix = "";
         } else {