Fix typos and add padding in Sessions info banner

[use-tusk]

This PR addresses the following issues in the Sessions info banner for the Free plan:

• Corrects the typos in the text content, changing 'Sessions are a Pro feature' to 'Sessions is a Pro feature' and 'September 27st' to 'September 27th'.
• Adds a bottom margin (mb-2 class) to the InfoBox component to ensure it does not touch the demo below.

These changes improve the readability and visual spacing of the info banner on the Sessions page.

---

Browser testing result ✅

Success image

Step: [Verify] The info banner text reads 'Sessions is a Pro feature. In order to keep using them, you need to upgrade your plan before September 27th, 2024.'

The assertion states that the info banner text reads 'Sessions is a Pro feature. In order to keep using them, you need to upgrade your plan before September 27th, 2024.' The HTML content shows a

element with the name attribute 'Sessions is a Pro feature.' and a

element with the text 'Sessions is a Pro feature. In order to keep using them, you need to upgrade your plan before September 27th, 2024.' This matches the assertion exactly. The screenshot also confirms the presence of this text in the info banner at the top of the page.

---

Tips:

• Make sure to test changes before merging.
• Submit a "Request Changes" review and I'll address it.
• Close this PR with a comment if it's obviously incorrect. This will improve my future PRs.
• Go to the Tusk activity logs to see more details.

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
helicone	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 27, 2024 0:19am
helicone-bifrost	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 27, 2024 0:19am
helicone-eu	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 27, 2024 0:19am