Help/About: Add images to the About page

[ryelle]

Additionally, this fixes a few missed apostrophes in the page content.

Trac ticket: https://core.trac.wordpress.org/ticket/60303

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[github-actions]

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Props ryelle, benjamin_zekavica.

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[BenjaminZekavica]

@ryelle It looks amazing :) Thank you

[github-actions]

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[ryelle]

Committed in r57767