chore: add missing comment for init progress bar function #330

Job	Run time
Formatting	5s
Clippy (stable)	26s
Check minimal supported rust version (MSRV).	2m 24s
Clippy (beta)	28s
Build and test (ubuntu, stable)	58s
Clippy (nightly)	27s
Build and test (ubuntu, beta)	1m 5s
Build and test (ubuntu, nightly)	1m 3s
Build and test (macos, stable)	43s
Build and test (macos, beta)	1m 11s
Build and test (macos, nightly)	1m 19s
Build and test (windows, stable)	1m 51s
Build and test (windows, beta)	2m 13s
Build and test (windows, nightly)	1m 55s
	16m 8s

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