Add labeling on PicoGreen Quantification page indicating expected format for files to be uploaded

[AmandaBirmingham]

csv, tsv, text, whatever
Raised in amplicon walkthrough 07/30/2018

[charles-cowart]

Moving to nice-to-haves, as it seems that the lab is more familiar with LC now.

[charles-cowart]

Going to assume this is only for Picogreen Quantification dialog, since it's the only occurrence of upload I'm familiar with.

[AmandaBirmingham]

@charles-cowart yep. Adjusting issue name to clarify :)

[AmandaBirmingham]

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