🐛 FIX: create-block command in ReadMe.md

[asharirfan]

Description

This PR corrects the create block command documentation in the ReadMe.md file.

Screenshot

Other

• [ ] Is this issue accessible? (Section 508/WCAG 2.1AA)
• [ ] Does this pass CrossBrowserTesting.com? (Edge, Safari, Chrome, Firefox)
• [ ] Will this pull request require updating the wiki?