docs(ist): indicate sorption in IST and MST must be same (#2181) #3880

Job	Run time
Check format	1m 11s
Build	1m 44s
Smoke test	5m 56s
Test Intel fortran (ubuntu-22.04)	40m 20s
Test Intel fortran (macos-13)	25m 20s
Extended testing (ubuntu-22.04)	19m 49s
Test Intel fortran (windows-2022)	34m 35s
Test GNU fortran (macos-13, false)	42m 32s
Extended testing (macos-13)	40m 33s
Test GNU fortran (macos-14, false)	34m 29s
Extended testing (windows-2022)	48m 57s
Test GNU fortran (macos-14, true)	1h 8m 2s
Test GNU fortran (ubuntu-22.04, false)	39m 8s
Test GNU fortran (ubuntu-22.04, true)	1h 33m 50s
Test GNU fortran (windows-2022, false)	48m 54s
	9h 5m 20s

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