Clarify that the 'labels' parameter creates new labels in Issues API

What does this MR do and why?

Currently, the documentation for the API request to create a new issue (POST /projects/:id/issues) says:

labels — Comma-separated label names for an issue.

It doesn't explain what happens if the label doesn't already exist. This MR adds documentation describing the current behavior.

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marked this merge request as ready

added Community contribution label

mentioned in issue gitlab-org/quality/triage-reports#17091 (closed)

added docs-only label

added devopscreate label

added sectiondev label

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requested review from @aqualls

@aqualls Could you help out with reviewing this Community contribution? Thank you 🙇

assigned to @smokris

added Technical Writing devopsplan docsimprovement documentation groupproject management maintenancerefactor labels and removed devopscreate label

requested review from @mcelicalderonG and removed review request for @aqualls

added Category:Team Planning label

requested review from @aqualls

requested review from @msedlakjakubowski

changed milestone to %16.11

added twfinished workflowin review labels

added 1 commit

• 1a7bd419 - Use present tense

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