docs: fix typo in ASAR integrity docs

[crutchcorn]

Description of Change

This PR fixes a small typo that causes a rendering issue on the ASAR integrity page:

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• tests are changed or added
• relevant documentation, tutorials, templates and examples are changed or added
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: none

[welcome]

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[erickzhao]

docs: lgtm

thanks!

[electron-docs-reviewer]

Approving on behalf of the Electron Docs Team

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[release-clerk]

No Release Notes

[trop]

I have automatically backported this PR to "31-x-y", please check out #42625

[trop]

I have automatically backported this PR to "32-x-y", please check out #42626