Small typo fix

[AdamDang]

Fix the typos :
"a ssh"->"an ssh"
"an new ssh"->"a new ssh"

[AdamDang]

/assign @geojaz

[chrisz100]

Just comment changes so no way affecting functionality.

Thanks @AdamDang !

/ok-to-test
/lgtm
/assign @mikesplain

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[chrisz100]

/area documentation

[chrisz100]

@AdamDang before we merge this, can you please complete:

FAIL: make verify-gendocs failed, as the generated markdown docs are out of date.
FAIL: Please run the following command: make gen-cli-docs.

[bheesham]

Looks like there's a lot of overlap with #4687. The only files not covered are:

• docs/cli/kops_rolling-update.md; and
• docs/cli/kops_rolling-update_cluster.md.

[justinsb]

Going to force-merge and throw into the docs-fix PR I have for the other one where I did the same thing.

Thanks for the fix @AdamDang !