Update product-tour.md

[Jemeni11]

Fixed a typo on line 10

General Contributing:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

All New Content Submissions: (To be confirmed by reviewer)

• Title is short & specific
• Headers are logically ordered & consistent
• Purpose of document is explained in the first paragraph
• Procedures are tested and work
• Any technical concepts are explained or linked to
• Document follows structure from templates
• All links work
• The spelling and grammar checker has been run
• Graphics and images are clear and useful
• Any prerequisites and next steps are defined.

[vercel]

@Jemeni11 is attempting to deploy a commit to the TinaCMS Team on Vercel.

A member of the Team first needs to authorize it.

[CLAassistant]

All committers have signed the CLA.