docs: update directive example with correct picture output interface

[juliendargelos]

• Quick Checklist

• I have read the contributing guidelines
• I have written new tests, as applicable (for bug fixes / features) Not applicable
• Docs have been added / updated (for bug fixes / features) Not applicable
• I have added a changeset, if applicable Not applicable

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Update directive example with correct picture output interface and valid html.

• What is the new behavior (if this is a feature change)?
  Not applicable

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
  No

• Other information:
  None

[changeset-bot]

⚠️ No Changeset found

Latest commit: ddbc460

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[benmccann]

The docs are generally auto generated so probably you need to find where this is coming from