Add a release note (bug)

Git for Windows used [to issue a misleading warning when `.gitignore`
was a directory](git-for-windows/git#5068),
which has been
[fixed](git-for-windows/git#5342).

Signed-off-by: gitforwindowshelper[bot] <gitforwindowshelper-bot@users.noreply.github.com>

ReleaseNotes.md

@@ -51,6 +51,7 @@ Git for Windows is distributed with other components yet, such as Bash, zlib, cu
 
 * The installer now correctly blocks the installation on Windows 7 and Windows 8 as these versions of Windows are no longer supported since Git for Windows v2.47.0
 * When using the `cache` credential helper, it could error out with "fatal: unable to connect to cache daemon: Unknown error" under certain circumstances; This [was fixed](https://github.com/git-for-windows/git/pull/5329).
+* Git for Windows used [to issue a misleading warning when `.gitignore` was a directory](https://github.com/git-for-windows/git/issues/5068), which has been [fixed](https://github.com/git-for-windows/git/pull/5342).
 
 ## Changes since Git for Windows v2.47.1 (November 25th 2024)