Change man-pages maintainer address

The email address that I use for man-pages maintenance has changed as of
now.  This patch changes the address in Documentation/HOWTO and
MAINTAINERS.

Signed-off-by: Michael Kerrisk <mtk.manpages@googlemail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Documentation/HOWTO

@@ -77,7 +77,7 @@ 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@gmx.net.
+maintainer at mtk.manpages@gmail.com.
 
 Here is a list of files that are in the kernel source tree that are
 required reading:

MAINTAINERS

@@ -2486,7 +2486,7 @@ S: 	Supported
 
 MAN-PAGES: MANUAL PAGES FOR LINUX -- Sections 2, 3, 4, 5, and 7
 P:	Michael Kerrisk
-M:	mtk-manpages@gmx.net
+M:	mtk.manpages@gmail.com
 W:	ftp://ftp.kernel.org/pub/linux/docs/manpages
 S:	Maintained