Set up release notes for BIND 9.18.25

(cherry picked from commit eef4bc99d0)

doc/notes/notes-current.rst

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+.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+..
+.. SPDX-License-Identifier: MPL-2.0
+..
+.. 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 https://mozilla.org/MPL/2.0/.
+..
+.. See the COPYRIGHT file distributed with this work for additional
+.. information regarding copyright ownership.
+
+Notes for BIND 9.18.25
+----------------------
+
+Security Fixes
+~~~~~~~~~~~~~~
+
+- None.
+
+New Features
+~~~~~~~~~~~~
+
+- None.
+
+Removed Features
+~~~~~~~~~~~~~~~~
+
+- None.
+
+Feature Changes
+~~~~~~~~~~~~~~~
+
+- None.
+
+Bug Fixes
+~~~~~~~~~
+
+- None.
+
+Known Issues
+~~~~~~~~~~~~
+
+- There are no new known issues with this release. See :ref:`above
+  <relnotes_known_issues>` for a list of all known issues affecting this
+  BIND 9 branch.