fix(sdk): dsl.component docstring typo

[dandawg]

Description of your changes:
One of the parameters (target_image) to the kfp.dsl.component decorator had a word missing in the docstring, which made it confusing. This PR adds the word.

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[google-oss-prow]

Hi @dandawg. Thanks for your PR.

I'm waiting for a kubeflow 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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[hbelmiro]

/lgtm
/ok-to-test

[hbelmiro]

/ok-to-test

[github-actions]

Approvals successfully granted for pending runs.

[DharmitD]

/lgtm

[HumairAK]

/approve

thanks!

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: HumairAK

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