Docs: Fix the highlight positions on event parser

[rubenfonseca]

What were you searching in the docs?

While reading the parser utility documentation, I noticed that some of the highlights are on the wrong line number.

Is this related to an existing documentation section?

https://awslabs.github.io/aws-lambda-powertools-python/2.11.0/utilities/parser/#parsing-events

How can we improve?

Fix the highlighted lines.

Got a suggestion in mind?

No response

Acknowledgment

• I understand the final update might be different from my proposed suggestion, or refused.

[github-actions]

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