Update user-guide.md

[elben10]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

The following pull request added support for statefulsets, but does not appear in the list of possible values of the label kompose.controller.type in the user guide. This PR fixes this.

Which issue(s) this PR fixes:

None

Special notes for your reviewer:

None

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: elben10 / name: Jakob Jul Elben (e4aef09)

[k8s-ci-robot]

Welcome @elben10!

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[AhmedGrati]

LGTM!
Thank you for the contribution @elben10 🙏

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AhmedGrati, elben10

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