SubList function documentation

[charan2628]

• Sublist function documentation

Description

Documentation for new sublist function opensearch-project/data-prepper#5535 .

Issues Resolved

Closes #[delete this text, including the brackets, and replace with the issue number]

Version

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

Frontend features

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[charan2628]

@graytaylor0 please review my documentation for sublist PR opensearch-project/data-prepper#5535

[Naarcha-AWS]

@charan2628, @graytaylor0, and @dlvenable: I added my edits to this page, breaking up the examples and offering additional explanations. Let me know if these changes work for you.