Fix some -Wmaybe-uninitialized warnings

doc/91_relnotes.qbk

@@ -1,7 +1,7 @@
 [/
     Boost.Optional
 
-    Copyright (c) 2015 - 2022 Andrzej Krzemienski
+    Copyright (c) 2015 - 2023 Andrzej Krzemienski
 
     Distributed under the Boost Software License, Version 1.0.
     (See accompanying file LICENSE_1_0.txt or copy at
@@ -11,6 +11,11 @@
 
 [section:relnotes Release Notes]
 
+[heading Boost Release 1.85]
+
+* Fixed the implementation for trivial types. Now it is slower, because it always initializes the `T`, but it avoids undefined behavior when `optional<T>` is copied. This fixes [@https://github.com/boostorg/optional/issues/108 issue #108].
+* Fixed some `-Wmaybe-uninitialized` warnings in GCC 12. Thanks to Christian Mazakas for the fix.
+
 [heading Boost Release 1.83]
 
 * Deprecated support for C++03 and earlier, C++11 will be required in release 1.86.