[SHMEM-1.6 Sec-9.6-9.9] Updates to RMA, AMO, PWS, and Sessions

[isubsmith]

Summary of changes

This PR includes all the changes needed for SHMEM-1.6 RC1 in the Sections 9.6-9.9 covering RMA, AMO, put-with-signal, and Sessions operations. The following changes are included as part of this change:

• 529

• 530

• 531

• 532

• 533

• 514

• 534

Proposal Checklist

• [ ] Link to issue(s)
• [ ] Changelog entry
• [ ] Reviewed for changes to front matter
• [ ] Reviewed for changes to back matter

[isubsmith]

@jdinan #532 might be controversial. Was "different PE" explicitly used for some nonobvious reason?