CREDITS, MAINTAINERS, docs/process/howto: Update man-pages' maintainer

Michael retired from maintaining the Linux man-pages project in 2021.
See commit 06e72cb19c74d3b1d661609c698ee26d7b6e4d7e ("CONTRIBUTING,
README, lsm: Remove mtk as maintainer") in the Linux man-pages
repository.

Add him to CREDITS.

Reported-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Link: <https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/commit/?id=06e72cb19c74d3b1d661609c698ee26d7b6e4d7e>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Michael Kerrisk <mtk@man7.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20240101124242.8059-2-alx@kernel.org

Author: alejandro-colomar

CREDITS

@@ -1828,6 +1828,13 @@ S: K osmidomkum 723
 S: 160 00 Praha 6
 S: Czech Republic
 
+N: Michael Kerrisk
+E: mtk.manpages@gmail.com
+W: https://man7.org/
+P: 4096R/3A35CE5E E522 595B 52ED A4E6 BFCC  CB5E 8561 9911 3A35 CE5E
+D: Maintainer of the Linux man-pages project
+D: Linux man pages online, at <https://man7.org/linux/man-pages/>
+
 N: Niels Kristian Bech Jensen
 E: nkbj1970@hotmail.com
 D: Miscellaneous kernel updates and fixes.

Documentation/process/howto.rst

@@ -82,8 +82,7 @@ documentation files are also added which explain how to use the feature.
 When a kernel change causes the interface that the kernel exposes to
 userspace to change, it is recommended that you send the information or
 a patch to the manual pages explaining the change to the manual pages
-maintainer at mtk.manpages@gmail.com, and CC the list
-linux-api@vger.kernel.org.
+maintainer at alx@kernel.org, and CC the list linux-api@vger.kernel.org.
 
 Here is a list of files that are in the kernel source tree that are
 required reading:

MAINTAINERS

@@ -12746,7 +12746,7 @@ F:	drivers/mailbox/arm_mhuv2.c
 F:	include/linux/mailbox/arm_mhuv2_message.h
 
 MAN-PAGES: MANUAL PAGES FOR LINUX -- Sections 2, 3, 4, 5, and 7
-M:	Michael Kerrisk <mtk.manpages@gmail.com>
+M:	Alejandro Colomar <alx@kernel.org>
 L:	linux-man@vger.kernel.org
 S:	Maintained
 W:	http://www.kernel.org/doc/man-pages