Mention New Feature in release notes

The experimental FSMonitor patches were replaced with [a newer
version](git-for-windows/git#3350).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

ReleaseNotes.md

@@ -47,6 +47,7 @@ This package contains software from a number of other projects including Bash, z
 * Comes with [Perl v5.34.0](http://search.cpan.org/dist/perl-5.34.0/pod/perldelta.pod) (and some updated Perl modules).
 * It is [now possible](https://github.com/git-for-windows/build-extra/pull/367) to ask Git for Windows to use an SSH found on the `PATH` instead of its bundled OpenSSH executable.
 * Comes with [Git Credential Manager Core v2.0.498.54650](https://github.com/microsoft/git-credential-manager-core/releases/tag/v2.0.498).
+* The experimental FSMonitor patches were replaced with [a newer version](https://github.com/git-for-windows/git/pull/3350).
 
 ### Bug Fixes