(doc) Update Invalid URL rule severity

[AdmiringWorm]

Description Of Changes

This commit updates the severity of the URL that is currently marked as a requirement when validating URLs. This is done to reflect upcoming changes to package validator that makes similar changes.

Motivation and Context

To reflect changes coming to package validator.

Testing

• [x] I have previewed these changes using the Docker Container or another method before submitting this pull request.

Change Types Made

• [x] Minor documentation fix (typos etc.).
• [ ] Major documentation change (refactoring, reformatting or adding documentation to existing page).
• [ ] New documentation page added.
• [ ] The change I have made should have a video added, and I have raised an issue for this.
  • Issue #

Change Checklist

• [ ] Requires a change to menu structure (top or left-hand side)/
• [ ] Menu structure has been updated

Related Issue

N/A

[AdmiringWorm]

This PR is in draft until we release/deploy a new version of Package Validator