Issue-372 Clarify PMIX_CMD_LINE in spawn case.

[dsolt]

Signed-of-by: [email protected]

[rhc54]

Sounds right to me!

[jjhursey]

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[jjhursey]

PMIx ASC 1Q 2022

• Passed the first vote: 11 yes / 0 no / 0 abstain
• This is can be merged into main/v5 and v4 branches (I'll work on that)

[jjhursey]

Editorial: Rebased the reference branch without text changes to prepare to merge.