[doc nit] Fix section header "install operator-sdk"

[asalkeld]

No description provided.

[metal3-io-bot]

Hi @asalkeld. Thanks for your PR.

I'm waiting for a metal3-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[honza]

/ok-to-test
/lgtm

[dhellmann]

/approve

[metal3-io-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: asalkeld, dhellmann

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[metal3-io-bot]

@asalkeld: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
generate	49d032c	link	/test generate

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[asalkeld]

generate error is:

/bin/sh: 1: openapi-gen: not found

[maelk]

yes, that is because we changed the jobs to adapt for #655 that needs to go in first.

[asalkeld]

obsolete