[main] (forwardport #18101) Doc: Refine geoip filter example for 8.19

[mergify]

Added sample output structure for geoip filter

PREVIEW: https://logstash_bk_18101.docs-preview.app.elstc.co/guide/en/logstash/8.19/lookup-enrichment.html#geoip-def

Related:

• [Website]: Same snap as part of before and after example in logstash lookup geoip filter docs-content#2782
• Doc: Provide accurate post-geoip lookup example #18092

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  This is an automatic backport of pull request Doc: Refine geoip filter example for 8.19 #18101 done by Mergify.

[mergify]

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	deleted by us:   docs/static/transforming-data.asciidoc

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[karenzone]

DO NOT MERGE

ADOC PRs for 8.19 don't belong in MD source in main. The work for main is in this PR: #18092

[karenzone]

ADOC files don't belong in `main. Closing without merge.