[HPC] Need a way to explicitly specify which version of Training rules apply to our HPC rules

[sparticlesteve]

From the 2022-07-18 WG meeting:

• Probably use the snapshot at the time of hpc rules freeze
• But need to state this somewhere:
• perhaps add a link/tag to the appropriate raining rules in the HPC rule doc

[memani1]

Added text in the rules doc with PR at #501.

[sparticlesteve]

Fixed in #501