XS✔ ◾ Small fixes "custom-instructions"

[tiagov8]

From Seth's SugarLearning "how to write rules" approval

[github-actions]

Invalid Frontmatter detected in rules/custom-instructions/rule.md, see details:

• 'created' must not be empty.

Please fix the Frontmatter in your Markdown files.

[github-actions]

PR Metrics

✔ Thanks for keeping your pull request small.
✔ Thanks for adding tests.

	Lines
Product Code	0
Test Code	0
Subtotal	0
Ignored Code	5
Total	5

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