curate format-dates: Mention that 'XX' can be used in `--expected-date-formats` #3179

Job	Run time
mypy	54s
test (python=3.9 biopython=1.80)	13m 59s
test (python=3.9 biopython=1.82)	13m 8s
test (python=3.9 biopython=latest)	13m 6s
pathogen-repo-ci (dengue)	2m 51s
pathogen-repo-ci-v0 (avian-flu)	53s
test (python=3.10 biopython=1.80)	13m 45s
pathogen-repo-ci (lassa)	7m 22s
pyright	14s
pathogen-repo-ci-v0 (ebola)	55s
test (python=3.10 biopython=1.82)	13m 36s
pathogen-repo-ci (measles)	1m 22s
pathogen-repo-ci-v0 (mumps)	56s
test (python=3.10 biopython=latest)	13m 35s
pathogen-repo-ci-v0 (ncov)	1m 9s
pathogen-repo-ci-v0 (rsv)	8m 28s
test (python=3.11 biopython=1.80)	13m 57s
pathogen-repo-ci (mpox)	1m 25s
check-docs	40s
test (python=3.11 biopython=1.82)	13m 29s
pathogen-repo-ci-v0 (seasonal-flu)	1m 9s
pathogen-repo-ci-v0 (tb)	1m 26s
test (python=3.11 biopython=latest)	13m 30s
test (python=3.12 biopython=1.82)	20m 15s
pathogen-repo-ci (oropouche)	1m 39s
test (python=3.12 biopython=latest)	20m 39s
pathogen-repo-ci (rabies)	2m 44s
pathogen-repo-ci (seasonal-cov)	1m 27s
pathogen-repo-ci (wnv)	1m 9s
pathogen-repo-ci (yellow-fever)	4m 29s
pathogen-repo-ci (zika)	1m 3s
build-docs / build	2m 39s
codecov	10s
release	0s
rebuild-docker-image	0s
	3h 28m 3s

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