Users: Get rid off period after "Learn more"

[mmtr]

Issue reported during walkthrough: p58i-iKo-p2

There shouldn't be a period after the "Learn more" link that appears in the subtitle of the "Users > All Users" page. It's not a full sentence, just a link.

See how the same link in Jetpack Stats doesn't have that perior:

[github-actions[bot]]

OpenAI suggested the following labels for this issue:

• [Feature Group] User Management: This issue relates to how user interface elements are presented, specifically regarding clarity and tidiness in the user management section.
• [Feature] User Interaction & Engagement: The issue deals with the engagement aspect of the platform, enhancing user experience through proper formatting and presentation of interactive elements.
• [Feature] Support Docs Content: The concern raised may require updates to support documentation to reflect the correct design practices for text elements.