[DOC] Update dissect processor documentation to include delete_source option

[alamzeeshan]

Update dissect processor documentation to include delete_source option

We added delete_source option for dissect processor as per opensearch-project/data-prepper#5662. We should update the document accordingly.

• [ x] Request a change to existing documentation
• Add new documentation
• Report a technical problem with the documentation
• Other

Tell us about your request. Provide a summary of the request.

Version: List the OpenSearch version to which this issue applies, e.g. 2.14, 2.12--2.14, or all.

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[alamzeeshan]

Can this issue be assigned to me. I will update the docs.

[Naarcha-AWS]

@alamzeeshan: Done