doc: Add release notes describing libexec/ binaries

doc/release-notes-31375-31679.md

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+New command line interface
+--------------------------
+
+A new `bitcoin` command line tool has been added to make features more
+discoverable and convenient to use. The `bitcoin` tool just calls other
+executables and does not implement any functionality on its own. Specifically
+`bitcoin node` is a synonym for `bitcoind`, `bitcoin gui` is a synonym for
+`bitcoin-qt`, and `bitcoin rpc` is a synonym for `bitcoin-cli -named`. Other
+commands and options can be listed with `bitcoin help`. The new tool does not
+replace other tools, so existing commands should continue working and there are
+no plans to deprecate them.
+
+Install changes
+---------------
+
+The `test_bitcoin` executable is now located in `libexec/` rather than `bin/`.
+It can still be executed directly, or accessed through the new `bitcoin` command
+line tool as `bitcoin test`.
+
+Other executables which are only part of source releases and not built by
+default: `test_bitcoin-qt`, `bench_bitcoin`, `bitcoin-chainstate`,
+`bitcoin-node`, and `bitcoin-gui` are also now installed in `libexec/`
+instead of `bin/` and can be accessed through the `bitcoin` command line tool.
+See `bitcoin help` output for details.

doc/release-notes-31375.md

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-New command line interface
---------------------------
-
-A new `bitcoin` command line tool has been added to make features more
-discoverable and convenient to use. The `bitcoin` tool just calls other
-executables and does not implement any functionality on its own.  Specifically
-`bitcoin node` is a synonym for `bitcoind`, `bitcoin gui` is a synonym for
-`bitcoin-qt`, and `bitcoin rpc` is a synonym for `bitcoin-cli -named`. Other
-commands and options can be listed with `bitcoin help`. The new tool does not
-replace other tools, so all existing commands should continue working and there
-are no plans to deprecate them.