I made some additional documentation comments on the flu A and B GISAID data pulls so I don't forget. Changes were made to two files in bin/aux/pulling-sequences on details related to the fasta header format. For reference the fasta header format used previously when downloading the flu A and flu B data was as follows:

Isolate ID | DNA Accession no. | Isolate name | Segment | Segment number

PR checklist

• This comment contains a description of changes (with reason).
• If you've fixed a bug or added code that should be tested, add tests!
• If you've added a new tool - have you followed the pipeline conventions in the contribution docs
• If necessary, also make a PR on the nf-core/refmaker branch on the nf-core/test-datasets repository.
• Make sure your code lints (nf-core lint).
• Ensure the test suite passes (nextflow run . -profile test,docker --outdir <OUTDIR>).
• Usage Documentation in docs/usage.md is updated.
• Output Documentation in docs/output.md is updated.
• CHANGELOG.md is updated.
• README.md is updated (including new tool citations and authors/contributors).