Update Let's Encrypt Ingress Docs to Address YAML Format Error

[codymwalker]

Addresses an indention error in the example code per CertManager docs for IngressTemplate (https://cert-manager.io/docs/configuration/acme/http01/#ingresstemplate)

[prmerger-automator]

@codymwalker : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit d834367:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/application-gateway/ingress-controller-letsencrypt-certificate-application-gateway.md	✅Succeeded

For more details, please refer to the build report.

[ttorble]

@mbender-ms

Can you review the proposed changes?

IMPORTANT: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

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[mbender-ms]

#sign-off

[mbender-ms]

#sign-off