Update dense-vector.asciidoc

[JohannesMahne]

Formatting: removing 2 + signs that breaks formatting

• Have you signed the contributor license agreement?
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[github-actions]

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[elasticsearchmachine]

@JohannesMahne please enable the option "Allow edits and access to secrets by maintainers" on your PR. For more information, see the documentation.

[elasticsearchmachine]

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

[leemthompo]

Hi @JohannesMahne I see you have two PRs open against the same file. Do you want to close #114692?

[leemthompo]

Looks like this was fixed in meantime: https://www.elastic.co/guide/en/elasticsearch/reference/current/dense-vector.html#dense-vector-params

Thanks for opening PR in any case!