[chore] fix typo

[tenzen-y]

What this PR does / why we need it:
I fixed some typos.

Which issue(s) this PR fixes (optional, in Fixes #<issue number>, #<issue number>, ... format, will close the issue(s) when PR gets merged):
Fixes #

Checklist:

• Docs included if any changes are user facing

[coveralls]

Pull Request Test Coverage Report for Build 2810072880

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 17 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.1%) to 39.812%

---

Files with Coverage Reduction	New Missed Lines	%
pkg/controller.v1/mpi/mpijob_controller.go	8	77.27%
pkg/controller.v1/pytorch/pytorchjob_controller.go	9	61.81%

Totals
Change from base Build 2801069939:	-0.1%
Covered Lines:	2325
Relevant Lines:	5840

---

💛 - Coveralls

[gaocegege]

LGTM 👍
/lgtm

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gaocegege, tenzen-y

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