Update spark-operator getting started guide

[ChenYi015]

Close #3893

[google-oss-prow]

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[varodrig]

@ChenYi015 the issue is associated the PR is closed. please let us know if this PR relates to another issue since we are working on keeping issues and PRs up to date. thank you

[google-oss-prow]

@varodrig: Closed this PR.

In response to this:

/close

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[varodrig]

/reopen

[google-oss-prow]

@varodrig: Reopened this PR.

In response to this:

/reopen

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