Style for rendered markdown doesn't work outside the description preview

**Before we start...:**

- [x] I checked the documentation and found no answer
- [x] I checked to make sure that this issue has not already been filed
- [x] I'm reporting the issue to the correct repository (for multi-repository projects)

**Branch/Commit:**

Main branch

**Expected behavior:**

When entering extra info, the preview should behave the same way as the description preview, with proper formatting (like bold font, lists, etc)

**Actual behavior:**

The font formatting and other styles are lost for the extra info preview.

**Steps to reproduce:**

1. Step 1: Write content in the Description with things like bold font or a list
2. Step 2: Copy the same content in Extra Info
3. Step 3: Note that the preview is different

**Screenshots and Videos**


**I will abide by the [code of conduct](https://github.com/fastruby/points/blob/main/CODE_OF_CONDUCT.md)**

Reproduce the difference by entering bold text and a list in both the Description and Extra Info previews, then trace the preview rendering implementation in the Rails application. Done means Extra Info preserves the same markdown formatting and styles as the Description preview.

Written by the indexing model from the issue text.