Added release notes for python-pillow#8483

Author: radarhere

docs/releasenotes/11.1.0.rst

@@ -17,8 +17,26 @@ TODO
 Backwards Incompatible Changes
 ==============================
 
-TODO
-^^^^
+Writing XMP bytes to JPEG and MPO
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Pillow 11.0.0 added writing XMP data to JPEG and MPO images::
+
+    im.info["xmp"] = b"test"
+    im.save("out.jpg")
+
+However, this meant that XMP data was automatically kept from an opened image,
+which is inconsistent with the rest of Pillow's behaviour. This functionality
+has been removed. To write XMP data, the ``xmp`` argument can still be used for
+JPEG files::
+
+    im.save("out.jpg", xmp=b"test")
+
+To save XMP data to the second frame of an MPO image, ``encoderinfo`` can now
+be used::
+
+    second_im.encoderinfo = {"xmp": b"test"}
+    im.save("out.mpo", save_all=True, append_images=[second_im])
 
 Deprecations
 ============