Fix template pages that have the wrong heading size

[joelanman]

We generally use L in services for questions, not XL.

What

The current templates on the Prototype Kit use XL in headings.

• Identify and fix the templates
• Implement changes

Why

Who needs to work on this

Content designer, developer

Who needs to review this

Developer

Done when

• [ ] Templates to change are identified
• [ ] headings are changed on templates
• [ ] PR to make changes to templates merged

[NoraGDS]

Pages to change identified: https://docs.google.com/spreadsheets/d/1SBldQu1xdbU1W6feN45u4fvuLz_zgeWjR29udugV6_8/edit#gid=0