Add an example of enrichment prior to sending to DLQ

[rockwotj]

Description

Resolves https://github.com/redpanda-data/documentation-private/issues/
Review deadline:

Page previews

Checks

• New feature
• Content gap
• Support Follow-up
• Small fix (typos, links, copyedits, etc)

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[hyperlint-ai]

PR Change Summary

Enhanced error handling documentation by providing an example of data enrichment before sending messages to the Dead Letter Queue (DLQ).

• Added an example of attaching metadata to error messages before routing to the DLQ.
• Clarified the use of processors for enriching error messages.
• Updated the documentation to improve understanding of error routing.

Modified Files

• modules/configuration/pages/error_handling.adoc

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[asimms41]

Just a couple of minor updates.

[asimms41]

LGTM