[SWDEV-551318] Add doc about RAS / CPER (#636)

* add doc about ras/cper
* add sample code examples for CPER and AFID
---------

Signed-off-by: Park, Peter <Peter.Park@amd.com>
Signed-off-by: Arif, Maisam <Maisam.Arif@amd.com>
Co-authored-by: Oosman Saeed <oossaeed@amd.com>

[ROCm/amdsmi commit: 5e92adc5b3]

projects/amdsmi/docs/sphinx/_toc.yml.in

@@ -44,6 +44,10 @@ subtrees:
   - file: reference/changelog.md
     title: Changelog
 
+- caption: Conceptual
+  entries:
+  - file: conceptual/ras.md
+
 - caption: Tutorials
   entries:
   - url: https://github.com/ROCm/amdsmi/tree/amd-staging/example