Add authors to license header. (#14371)

Signed-off-by: Thomas Parnell <tpa@zurich.ibm.com>
Co-authored-by: Burkhard Ringlein <ngl@zurich.ibm.com>
Co-authored-by: Jan van Lunteren <jvl@zurich.ibm.com>

vllm/attention/ops/chunked_prefill_paged_decode.py

 # SPDX-License-Identifier: Apache-2.0
 
+# Authors:
+#  - Burkhard Ringlein
+#  - Jan van Lunteren
+#  - Thomas Parnell
+
 import torch
 import triton
 import triton.language as tl