Update es-connectors-mongodb.md

[artem-shelkovnikov]

Part of elastic/connectors#3299

Reflection of elastic/connectors#3459 in documentation.

We will support native UUID deserialisation with 8.18.3+, but for later versions of connectors framework or non-default UUID driver setting we still need to provide the information on how to set the connector up to be able to properly ingest documents that have UUID fields.

[elasticsearchmachine]

Pinging @elastic/es-docs (Team:Docs)

[artem-shelkovnikov]

I've put a lot of versions in the backport list - this can be backported as far as the moment when MongoDB connector was introduced (it was our first connector) - maybe that's not the right thing to do and we backport up to 8.18.3. Either is fine for us.

[leemthompo]

Hey @artem-shelkovnikov! Unfortunately will have to open a separate PR for 8.18 and backport from there :)

[leemthompo]

@charlotte-hoblik perhaps you could review and suggest any edits on this PR whenever you get a chance this week?

[charlotte-hoblik]

Thanks! @artem-shelkovnikov Just suggested a few minor edits for clarity and consistency. Let me know if you have any questions.

[github-actions]

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