fix descriptor in config example #1853

Job	Run time
linter_gui	1m 42s
linter	32s
unit_tests (1.63, ubuntu-latest)	1m 48s
unit_tests (1.63, macOS-latest)	2m 7s
unit_tests (1.63, windows-latest)	3m 2s
unit_tests (nightly, ubuntu-latest)	55s
unit_tests (nightly, macOS-latest)	1m 22s
unit_tests (nightly, windows-latest)	1m 56s
unit_tests_gui (1.65.0, ubuntu-latest)	3m 39s
unit_tests_gui (1.65.0, macOS-latest)	3m 56s
unit_tests_gui (1.65.0, windows-latest)	5m 4s
unit_tests_gui (nightly, ubuntu-latest)	2m 26s
unit_tests_gui (nightly, macOS-latest)	6m 24s
unit_tests_gui (nightly, windows-latest)	4m 22s
	39m 15s

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