Fix heading hierarchy in crowdfunding-p1.md

[hugo-levet]

Description of the pull request (what is new / what has changed)

Fixed the title of "Step 4" to be h2 instead of h1

Did you test the changes locally ?

• [ ] yes
• [x] no

Which category (categories) does this pull request belong to?

• [ ] document new feature
• [ ] update documentation that is not relevant anymore
• [ ] add examples or more information about a component
• [ ] fix grammar issues
• [x] other