Remove trailing spaces (#16742)

[furukawa3]

This PR removes trailing spaces. I found all trailing spaces for following command:

sed -i 's/[ ]*$//' $(find content/ -type f -not -name "*.png" -not -name "*.jpg" -not -name "*.svg" -not -name "*.gif")

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[furukawa3]

/assign @xiangpengzhao

[furukawa3]

/assign @sftim

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[sftim]

@furukawa3 thank you for the PR.
Would you be willing to withdraw this pull request and replace it with several PRs, one per localization?
See working with localized content. Essentially, PRs that cover lots of locales need lots of approval.

[zacharysarah]

@furukawa3 Thanks for this update. I'm closing this PR but I agree with @sftim and would love to see these changes go forward in individual PRs per language.

/close

[k8s-ci-robot]

@zacharysarah: Closed this PR.

In response to this:

@furukawa3 Thanks for this update. I'm closing this PR but I agree with @sftim and would love to see these changes go forward in individual PRs per language.

/close

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[furukawa3]

I see. Thanks for your suggestion. I'll split this commit into each language!!