Minor fixup for release-description.md

[Haz3-jolt]

Purpose / Description

Removed extra horizontal rules on the description which were not needed.

Fixes

Extra horizontal rules

Approach

How Has This Been Tested?

Checked preview on markdown previewer

Learning (optional, can help others)

Checklist

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner