filter: Improve help text #2213

Job	Run time
test (python=3.8 biopython=1.80)	7m 38s
pathogen-repo-ci (avian-flu)	43s
test (python=3.8 biopython=latest)	8m 11s
pathogen-repo-ci (ebola)	52s
test (python=3.9 biopython=1.80)	8m 11s
pathogen-repo-ci (lassa)	46s
test (python=3.9 biopython=latest)	7m 46s
pathogen-repo-ci (mumps)	56s
test (python=3.10 biopython=1.80)	7m 53s
pathogen-repo-ci (ncov)	1m 0s
test (python=3.10 biopython=latest)	7m 57s
pathogen-repo-ci (rsv)	2m 31s
test (python=3.11 biopython=1.80)	8m 30s
pathogen-repo-ci (seasonal-flu)	1m 5s
test (python=3.11 biopython=latest)	7m 40s
pathogen-repo-ci (tb)	1m 25s
build-docs / build-conda	0s
build-docs / build-pip	56s
codecov	15s
	1h 14m 15s

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