docs: clarify example command in INSTALL.md #1500

Job	Run time
test_pet (ubuntu-latest)	4m 2s
test_pet (macos-latest)	4m 48s
test_bmi_c (ubuntu-latest)	4m 32s
test_bmi_c (macos-latest)	5m 54s
test_bmi_cpp (ubuntu-latest)	3m 30s
test_bmi_cpp (macos-latest)	4m 53s
test_bmi_fortran (ubuntu-latest)	3m 24s
test_bmi_fortran (macos-latest)	5m 44s
test_bmi_multi (ubuntu-latest)	4m 18s
test_bmi_multi (macos-latest)	8m 57s
test_bmi_python (ubuntu-latest)	4m 11s
test_bmi_python (macos-latest)	5m 54s
test_mpi_remote_nexus (ubuntu-latest)	1m 45s
test_unit (ubuntu-latest)	5m 36s
test_unit (macos-latest)	9m 42s
	1h 17m 10s

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