Updated comment

Author: radarhere

Tests/test_file_jpeg.py

@@ -934,7 +934,7 @@ def test_icc_after_SOF(self) -> None:
 
     def test_jpeg_magic_number(self, monkeypatch: pytest.MonkeyPatch) -> None:
         size = 4097
-        buffer = BytesIO(b"\xff" * size)  # Many xFF bytes
+        buffer = BytesIO(b"\xff" * size)  # Many xff bytes
         max_pos = 0
         orig_read = buffer.read