Update widget heading to H3 on Education letters

[laflannery]

Description

On the widget on the Education letters page, the widget should be updated to have an h3 heading instead of using the current <p> tag

Engineering notes / background

Analytics considerations

Testing & QA

Scope / Impact analysis

What, if anything, could break as a result of this change?
Engineer should assess this when approaching PR.

Roles / assignments

After functional testing, code review, accessibility review, and design review can happen in parallel.

• Functional testing:
• Code review:
• Design review:
• Accessibility review:
• Product acceptance:

Acceptance criteria

ACs should capture expected behavior, to inform test plans. Consider devices, documentation updates including KBs, change management, and content model when applicable.

• The widget heading "Sign in to download your VA education decision letter" is now using an h3 heading instead of using the current <p> tag
• Accessibility review