chore(prt): fix comment to reflect prohibition on pre-start releases #3884

Job	Run time
Check format	1m 14s
Build	1m 43s
Smoke test	6m 6s
Test Intel fortran (ubuntu-22.04)	38m 58s
Test GNU fortran (macos-13, false)	45m 19s
Test Intel fortran (macos-13)	33m 21s
Extended testing (ubuntu-22.04)	18m 3s
Test GNU fortran (macos-14, false)	34m 19s
Test Intel fortran (windows-2022)	35m 17s
Extended testing (macos-13)	43m 16s
Test GNU fortran (macos-14, true)	1h 7m 4s
Extended testing (windows-2022)	52m 50s
Test GNU fortran (ubuntu-22.04, false)	38m 5s
Test GNU fortran (ubuntu-22.04, true)	1h 29m 57s
Test GNU fortran (windows-2022, false)	46m 10s
	9h 11m 42s

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