Update description of sample column in samplesheet.csv

[SarahBailey1998]

Description of the bug

Not really a bug but I discovered that two rows cannot share the same sample ID. It might be good to make a note of that in the usage.md doc.

Command used and terminal output

No response

Relevant files

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System information

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[ignacio3437]

Also need to specify a sample group or the pipeline will only run the fastqc, not output the processed fasta/q files. Sample group can be same as sample name.