[ja] Update title in job.md

[Okabe-Junya]

Description

• Update Job title

FYI: https://kubernetes.io/ja/docs/contribute/localization/#terminology

またこれらの単語は、複数形ではなく単数形を用います。 例えば、原文に"pods"と表記されている場合でも、日本語訳では"Pod"と表記してください。

Issue

Closes: #

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[b1gb4by]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 3d7dfa75e8099c6feb71136a9871d68758df28ed

[Okabe-Junya]

/assign @bells17
for approval

[bells17]

/approve

[k8s-ci-robot]

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This pull-request has been approved by: bells17

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