doc/release: Add note on addition of CONFIG_FS_FATFS_MIN_SS

Note on CONFIG_FS_FATFS_MIN_SS being provided for FAT FS driver
configuration.

Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>
diff --git a/doc/releases/release-notes-3.2.rst b/doc/releases/release-notes-3.2.rst
index 5085249..e9e4bd6 100644
--- a/doc/releases/release-notes-3.2.rst
+++ b/doc/releases/release-notes-3.2.rst
@@ -1386,6 +1386,8 @@
   * Added cash used to reduce the NVS data lookup time, see
     :kconfig:option:`CONFIG_NVS_LOOKUP_CACHE` option.
   * Changing mkfs options to create FAT32 on larger storage when FAT16 fails.
+  * Added :kconfig:option:`CONFIG_FS_FATFS_MIN_SS` that allows to set
+    minimal expected sector size to be supported.
 
 * Management