Mention New Feature in release notes

Config settings referring to paths relative to where Git is installed
[now have to be marked via `%(prefix)/` instead of the now-deprecated
leading slash](git-for-windows/git#3472).

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

ReleaseNotes.md

@@ -40,6 +40,12 @@ Git for Windows also contains Embedded CAcert Root Certificates. For more inform
 
 This package contains software from a number of other projects including Bash, zlib, curl, tcl/tk, perl, MSYS2 and a number of libraries and utilities from the GNU project, licensed under the GNU General Public License. Likewise, it contains Perl which is dual licensed under the GNU General Public License and the Artistic License.
 
+## Changes since Git for Windows v2.33.1 (October 13th 2021)
+
+### New Features
+
+* Config settings referring to paths relative to where Git is installed [now have to be marked via `%(prefix)/` instead of the now-deprecated leading slash](https://github.com/git-for-windows/git/pull/3472).
+
 ## Changes since Git for Windows v2.33.0(2) (August 24th 2021)
 
 ### New Features