docs: Fix lambda_arn casing in pre_token_generation_config

[AndresMorelos]

Description

This PR corrects the casing of the lambda_arn variable in the documentation for the pre-token generation configuration. Previously, the casing may have been incorrect, leading to potential confusion or errors. The correction ensures that users referencing the documentation will use the correct casing for lambda_arn in their own configurations.

Relations

Closes #36420.
Relates #35236.

References

Output from Acceptance Testing

% make testacc TESTS=TestAccXXX PKG=ec2
Not needed since is documentation
...

[github-actions]

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[ewbankkit]

LGTM 🚀.

[ewbankkit]

@AndresMorelos Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v5.42.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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