Fix copyright year

Signed-off-by: John Pennycook <[email protected]>

Author: Pennycook

sycl/doc/extensions/experimental/sycl_ext_oneapi_kernel_properties.asciidoc

@@ -21,7 +21,7 @@
 == Notice
 
 [%hardbreaks]
-Copyright (C) 2024 Intel Corporation.  All rights reserved.
+Copyright (C) 2021 Intel Corporation.  All rights reserved.
 
 Khronos(R) is a registered trademark and SYCL(TM) and SPIR(TM) are trademarks
 of The Khronos Group Inc.  OpenCL(TM) is a trademark of Apple Inc. used by