chore(docs): Add missing new line in Custom resources docs

[kozub]

Issue #, if available:

Description of changes:

Just a quick fix of typo in docs. Without now line markdown cannot be parse correctly. Currently the page title on https://awslabs.github.io/aws-lambda-powertools-java/utilities/custom_resources/ is displayed as: title: Custom Resources description: Utility

Checklist

• Meet tenets criteria
• Update tests
• Update docs
• PR title follows conventional commit semantics

Breaking change checklist

RFC issue #:

• Migration process documented
• Implement warnings (if it can live side by side)

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[pankajagrawal16]

Looks like this was also fixed by #763, even though this PR was opened first, i started looking at PR with the latest :) . Regardless thanks for spotting this @kozub and feel free to close it.

[kozub]

Hey @pankajagrawal16
No worries, it took just a minute to fix it. Happy to see that there are more people interested in making this project better :)