Documentation: ioctl-number: Fix linuxppc-dev mailto link

Spell out full Linux PPC mailing list address like other subsystem
mailing lists listed in the table.

Reviewed-by: Haren Myneni <haren@linux.ibm.com>
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Acked-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250714015711.14525-2-bagasdotme@gmail.com

Author: bagasme

Documentation/userspace-api/ioctl/ioctl-number.rst

@@ -362,15 +362,15 @@ Code  Seq#    Include File                                           Comments
 0xB1  00-1F                                                          PPPoX
                                                                      <mailto:mostrows@styx.uwaterloo.ca>
 0xB2  00     arch/powerpc/include/uapi/asm/papr-vpd.h                powerpc/pseries VPD API
-                                                                     <mailto:linuxppc-dev>
+                                                                     <mailto:linuxppc-dev@lists.ozlabs.org>
 0xB2  01-02  arch/powerpc/include/uapi/asm/papr-sysparm.h            powerpc/pseries system parameter API
-                                                                     <mailto:linuxppc-dev>
+                                                                     <mailto:linuxppc-dev@lists.ozlabs.org>
 0xB2  03-05  arch/powerpc/include/uapi/asm/papr-indices.h            powerpc/pseries indices API
-                                                                     <mailto:linuxppc-dev>
+                                                                     <mailto:linuxppc-dev@lists.ozlabs.org>
 0xB2  06-07  arch/powerpc/include/uapi/asm/papr-platform-dump.h      powerpc/pseries Platform Dump API
-                                                                     <mailto:linuxppc-dev>
+                                                                     <mailto:linuxppc-dev@lists.ozlabs.org>
 0xB2  08     powerpc/include/uapi/asm/papr-physical-attestation.h    powerpc/pseries Physical Attestation API
-                                                                     <mailto:linuxppc-dev>
+                                                                     <mailto:linuxppc-dev@lists.ozlabs.org>
 0xB3  00     linux/mmc/ioctl.h
 0xB4  00-0F  linux/gpio.h                                            <mailto:linux-gpio@vger.kernel.org>
 0xB5  00-0F  uapi/linux/rpmsg.h                                      <mailto:linux-remoteproc@vger.kernel.org>