Fixed bad image syntax and bold text

[juanmaguitar]

Description

Small fixes to docs

How has this been tested?

By using a markdown parser

[github-actions]

👋 Thanks for your first Pull Request and for helping build the future of Gutenberg and WordPress, @juanmaguitar! In case you missed it, we'd love to have you join us in our Slack community, where we hold regularly weekly meetings open to anyone to coordinate with each other.

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[annezazu]

Looks good to me! Thanks so much for spotting this and not just walking by a mistake but instead offering a fix :)

[ntsekouras]

Failing tests are not related at all, as this PR changes documentation. I'll merge this one.

[github-actions]

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