US 266-399 33.16.3p4,7 [exec.sysctxrepl.psb] Clarify phrasing "one of the expressions below"

[wg21bot]

The meaning of “one of the expressions below” is not clear (it is meant to exclude execute).

Proposed change:

Change to say “the call to set_value, set_error, or set_done on r”.

[jensmaurer]

Accepted.