en: fix a typo and update format

[lilin90]

What is changed, added, or deleted? (Required)

Fix a typo and remove extra spaces

Which TiDB Operator version(s) do your changes apply to? (Required)

• [x] master (the latest development version)
• [x] v1.5 (TiDB Operator 1.5 versions)
• [x] v1.4 (TiDB Operator 1.4 versions)
• [x] v1.3 (TiDB Operator 1.3 versions)
• [ ] v1.2 (TiDB Operator 1.2 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):

[lilin90]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lilin90

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/pingcap/docs-tidb-operator/blob/master/OWNERS)~~ [lilin90] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-1.3: #2413.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-1.4: #2414.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-1.5: #2415.