sysutils/cpu-microcode-rc: Update pkg-descr and pkg-message

- Note that the early loading is now available for AMD systems after
  2024-02-22 src snapshot, 34467bd76.
- Do not refer to old port names
- Refer to sysutils/cpu-microcode-* so we are covered if any new CPU
  microcode ports are added to the tree

Reviewed by:	chs
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D44048

sysutils/cpu-microcode-rc/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	microcode
 PORTVERSION=	1.0
-PORTREVISION=	1
+PORTREVISION=	2
 CATEGORIES=	sysutils
 MASTER_SITES=	# none
 PKGNAMEPREFIX=	cpu-

sysutils/cpu-microcode-rc/files/pkg-message.in

@@ -22,6 +22,9 @@ the CPU microcode on a FreeBSD system.
 
    The microcode update will be loaded when the system is rebooted.
 
+   AMD systems running FreeBSD prior to 2024-02-22 snapshot
+   34467bd76 only support late loading.
+
 
 2. Late loading.
    This method, which does use the RC script included here, is enabled by

sysutils/cpu-microcode-rc/pkg-descr

@@ -1,3 +1,10 @@
-An RC script for use with the cpuctl(4) microcode update facility to keep your
-processor's firmware up-to-date.  CPU microcode data must be installed from a
-vendor.  See sysutils/devcpu-data-amd and sysutils/devcpu-data-intel.
+An RC script for one of two methods to update CPU microcode.
+
+Early loading, which does not require this RC script, is usually the preferred
+method because updates are applied before the kernel performs CPU feature
+detection.  The other method, which requires this RC script, is late loading.
+AMD systems running FreeBSD prior to 2024-02-22 snapshot 34467bd76 only support
+late loading.
+
+CPU microcode data can be installed from one of the sysutils/cpu-microcode-*
+ports.