Bug - Broken link for PF design kit training

[maryshak1996]

Describe the problem
I had to update the URL for the design kit landing page on Thinkific.com, so the URLs on the design training page are broken and 404ing now.

Expected behavior
This URL just needs to be updated on on the PF design training page in the hint box and the cards (it's just a one-letter typo). Here are the correct URLs to fix this:

• Hint box: https://patternfly-training.thinkific.com/users/sign_up
• Introduction card: https://patternfly-training.thinkific.com/courses/take/pf-sketch-e-training/lessons/12824668-video
• Topic 1 card: https://patternfly-training.thinkific.com/courses/take/pf-sketch-e-training/lessons/12854000-video
• Topic 2 card: https://patternfly-training.thinkific.com/courses/take/pf-sketch-e-training/lessons/12855027-video
• Topic 3 card: https://patternfly-training.thinkific.com/courses/take/pf-sketch-e-training/lessons/12855102-video
• Topic 4 card: https://patternfly-training.thinkific.com/courses/take/pf-sketch-e-training/lessons/12855787-video
• Topic 5 card: https://patternfly-training.thinkific.com/courses/take/pf-sketch-e-training/lessons/12856030-video
• Topic 6 card: https://patternfly-training.thinkific.com/courses/take/pf-sketch-e-training/lessons/12856104-video
• Topic 7 card: https://patternfly-training.thinkific.com/courses/take/pf-sketch-e-training/lessons/12856217-video