DE doesn't perform p-value correction

### Background

Was looking at the responses for refine.bio examples feedback

### Problem

As reported
`The several group DE doesn't perform p-value correction (it makes the table but doesn't use the adjusted p-values later)`

The issue does not identify a file or test. Start by locating the several-group differential-expression example and trace where adjusted p-values are produced and where downstream results use p-values. Done means the later analysis uses the corrected values.

Written by the indexing model from the issue text.