Add sumologic_volume to list of audit data filters

[jpipkin1]

Purpose of this pull request

This pull request adds sumologic_volume under "Audit data filter" in this section:
https://help.sumologic.com/docs/manage/users-roles/roles/create-manage-roles/#create-a-role

Select the type of change

• Minor Changes - Typos, formatting, slight revisions
• Update Content - Revisions, updating sections
• New Content - New features, sections, pages, tutorials
• Site and Tools - .clabot, version updates, maintenance, dependencies, new packages for the site (Docusaurus, Gatsby, React, etc.)

Ticket (if applicable)

Created PR from a request in the #rbac-for-indexes Slack channel.