docs(DIANN): Update documentation on DIANN converter q-value filters

[tonywu1999]

Motivation and Context

It's unclear from a user perspective on what the q-value filters do, i.e. which columns are filtered.

Changes

• Update docs outlining which columns get filtered and what the columns represent. See reference

Testing

All unit tests pass

Checklist Before Requesting a Review

• I have read the MSstats contributing guidelines
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules