Minor improvements in 'kubectl run' flag help

[jpetazzo]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

I initially noticed a minor typo in --tty, and while fixing it,
I noticed small discrepancies in some other flags. These minor
changes should make the 'kubectl run' flag help slightly more
correct (hopefully). 🙂

Which issue(s) this PR fixes:

N/A

Special notes for your reviewer:

I didn't touch the flags that were marked for deprecation.

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

None

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @jpetazzo. Thanks for your PR.

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[lauchokyip]

/ok-to-test

[soltysh]

Thank you ❤️
/lgtm
/approve

[soltysh]

/triage accepted
/priority backlog

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jpetazzo, soltysh

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