EDAC/amd64: Document heterogeneous system enumeration

Document High Bandwidth Memory (HBM) and AMD heterogeneous system
topology and enumeration.

  [ bp: Simplify and de-marketize, unify, massage. ]

Signed-off-by: Muralidhara M K <muralidhara.mk@amd.com>
Co-developed-by: Naveen Krishna Chatradhi <naveenkrishna.chatradhi@amd.com>
Signed-off-by: Naveen Krishna Chatradhi <naveenkrishna.chatradhi@amd.com>
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230515113537.1052146-4-muralimk@amd.com