pmc: Fix copyright in previous commits

Fix the copyright attribution to Netflix and the date and missing SPDX
line in pmc.ibs man page.

Sponsored by: Netflix

Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/2094

lib/libpmc/pmc.ibs.3

@@ -1,4 +1,7 @@
-.\" Copyright (c) 2016 Ali Mashtizadeh.  All rights reserved.
+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
+.\" Copyright (c) 2026, Netflix, Inc.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions

sys/dev/hwpmc/hwpmc_ibs.c

@@ -1,8 +1,7 @@
 /*-
  * SPDX-License-Identifier: BSD-2-Clause
  *
- * Copyright (c) 2026, Ali Jose Mashtizadeh
- * All rights reserved.
+ * Copyright (c) 2026, Netflix, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions

sys/dev/hwpmc/hwpmc_ibs.h

@@ -1,8 +1,7 @@
 /*-
  * SPDX-License-Identifier: BSD-2-Clause
  *
- * Copyright (c) 2026, Ali Jose Mashtizadeh
- * All rights reserved.
+ * Copyright (c) 2026, Netflix, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions