Update NAb methods: Add template language for inclusion criteria for AUC-mb analysis

[monicagerber]

Location

inst/templates/methods-nab/nab-statistical-methods.Rmd

Old

The template currently doesn't have any language for this.

New

Alicia suggested we add language here, but we will need to decide on appropriate methods first. This came up in review of the NAb template: https://github.com/FredHutch/VISCtemplates/pull/99/files#r796188949

Justification

Alicia said that she noticed differences across the VISC team and compared to HVTN reports.

[mayerbry]

Completed #99