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 <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/process/embargoed-hardware-issues.rst

···
 an involved disclosed party. The current ambassadors list:
 
   ============= ========================================================
-  ARM           Grant Likely <[e-mail]>
   AMD		Tom Lendacky <[e-mail]>
-  IBM Z         Christian Borntraeger <[e-mail]>
-  IBM Power     Anton Blanchard <[e-mail]>
+  ARM		Grant Likely <[e-mail]>
+  IBM Power	Anton Blanchard <[e-mail]>
+  IBM Z		Christian Borntraeger <[e-mail]>
   Intel		Tony Luck <[e-mail]>
   Qualcomm	Trilok Soni <[e-mail]>