Documentation/process: Make groups alphabetical and use tabs consistently

The list appears to be grouped by type (silicon, software, cloud) and
mostly alphabetical within each group, with a few exceptions.

Before adding to it, cleanup the list to be alphabetical within the
groups, and use tabs consistently throughout the list.
Signed-off-by: Darren Hart <darren@os.amperecomputing.com>
Link: https://lore.kernel.org/r/ec574b5d55584a3adda9bd31b7695193636ff136.1650995848.git.darren@os.amperecomputing.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/process/embargoed-hardware-issues.rst

@@ -244,10 +244,10 @@ disclosure of a particular issue, unless requested by a response team or by
 an involved disclosed party. The current ambassadors list:
 
   ============= ========================================================
-  ARM           Grant Likely <grant.likely@arm.com>
   AMD		Tom Lendacky <tom.lendacky@amd.com>
-  IBM Z         Christian Borntraeger <borntraeger@de.ibm.com>
-  IBM Power     Anton Blanchard <anton@linux.ibm.com>
+  ARM		Grant Likely <grant.likely@arm.com>
+  IBM Power	Anton Blanchard <anton@linux.ibm.com>
+  IBM Z		Christian Borntraeger <borntraeger@de.ibm.com>
   Intel		Tony Luck <tony.luck@intel.com>
   Qualcomm	Trilok Soni <tsoni@codeaurora.org>