docs(lambda): add missing JSDoc Markdown code block

[nmussy]

Reason for this change

There is a missing Markdown code block in the EventSourceMapping documentation:

Description of changes

Adds missing Markdown code block tags

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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[kaizencc]

Hi @nmussy, putting the code block in means that we will attempt to compile the example with the default rosetta fixture and fail if it does not compile. If you want to contribute this, you'll have to work to get the example to a compiling state. You can test that locally with yarn rosetta:extract

Pull request has been modified.

[nmussy]

Hey @kaizencc, sorry about that, I forgot that the docs were also JSII transpiled. Should be good to go now 👍

[scanlonp]

Looks good, thanks!

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 396ee56
• Result: SUCCEEDED
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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).