Update the documentation file (help file) for the customMFitModels #1401

Job	Run time
Generate test matrix	11s
Test (ubuntu-20.04, 3.8)	3m 12s
Test (ubuntu-20.04, 3.9)	3m 19s
Test (ubuntu-20.04, 3.10)	2m 12s
Test (windows-latest, 3.8)	6m 16s
Test (windows-latest, 3.9)	8m 37s
Test (windows-latest, 3.10)	8m 10s
Test (macos-latest, 3.8)	6m 21s
Test (macos-latest, 3.9)	3m 49s
Test (macos-latest, 3.10)	3m 30s
Test (ubuntu-latest, 3.8)	2m 25s
Test (ubuntu-latest, 3.9)	2m 25s
Test (ubuntu-latest, 3.10)	2m 17s
Installer (ubuntu-20.04, 3.8)	14m 48s
Installer (windows-latest, 3.8)	19m 16s
Installer (macos-latest, 3.8)	27m 27s
Test installer (windows-latest, 3.8)	2m 18s
Test installer (ubuntu-20.04, 3.8)	1m 32s
	1h 58m 5s

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