Update ProdOps DRIs throughout the handbook

To suggest a change to the Product Handbook, please review the updating the Product Handbook section.

Related to: none

Please provide a brief explanation for this change:

(If there's a due date for merging this MR, be sure to include it here.)

Earlier this year, we made some staffing changes. Part of those staffing reorganized the Product Operations team leaving just @justinfarris as the sole DRI.

This MR updates handbook pages and project templates to reflect that reorganization.

Note to the reviewer: this also includes some typo fixes and whitespace formatting which may make this more time consuming to review. 🙏

Please indicate the types of revisions being suggested for the Product Handbook (please check all that apply):

• Small improvement (typos, clarifications, etc.)
• Adding a new section
• Modifying existing section
• Documenting a new process
• Adding a new page or directory
• Other

Please indicate Milestone

• Assigned to Milestone

Author Checklist

• Provided a concise title for the MR
• Provided a brief explanation for this change (Say why, not just what)
  • (Attach screenshots, Slack conversations, etc. as necessary)
• Indicated the types of changes included in this MR
• Verified that no confidential data is in this MR
• Assigned reviewers for this change to the correct DRI(s)
  • If the DRI for the page/s being updated isn’t immediately clear, then assign it to one of the people listed in the "Maintained by" section on the page being edited.
  • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in #mr-buddies.
• If the changes affect team members, or warrant an announcement in another way, please consider posting an update in #product or #whats-happening-at-gitlab linking to this MR.
  • If this is a change that directly impacts the majority of global team members, it should be a candidate for #company-fyi. Please work with internal communications and check the handbook for examples.