Chore: Update Discord channel names in "How to ask technical questions" page

[MaoShizhong]

Because

The channel names in the "How to ask technical questions" page were outdated.

This PR

• Updates names of mentioned channels.
• Use <b> tags for better "keyword" visibility for channel names.
• Adds missing period.

Issue

N/A

Additional Information

Pull Request Requirements

• I have thoroughly read and understand The Odin Project Contributing Guide
• The title of this PR follows the keyword: brief description of change format, using one of the following keywords:
  • Feature - adds new or amends existing user-facing behavior
  • Chore - changes that have no user-facing value, refactors, dependency bumps, etc
  • Fix - bug fixes
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• I have verified all tests and linters pass after making these changes.
• If this PR addresses an open issue, it is linked in the Issue section
• If applicable, this PR includes new or updated automated tests