Fix formatting and some wordings

[cw118]

Summary

• "Cleans up" some formatting (removes bold text where it's "unnecessary", edits for consistency, etc.)
• Fixes some small typos and grammar errors
• Rewords a few passages

Note: The focus of this PR was to "fix" the markdown formatting of the document, though I changed the wording of a few sentences that stood out to me. I noticed while editing that the same quote is used at lines 70, 81, 134, and 408, but I wasn't sure what to do about it, so I thought it best to leave revising/rewriting the page to someone more qualified.

Motivation

Primarily to remove out-of-place symbols from the document.

Related issues

Fixes #11222

Metadata

• Adds a new document
• Rewrites (or significantly expands) a document
• Fixes a typo, bug, or other error

[github-actions]

Preview URLs

• https://pr11265.content.dev.mdn.mozit.cloud/en-US/docs/Web/Accessibility/Seizure_disorders

Flaws

None! 🎉

External URLs

URL: /en-US/docs/Web/Accessibility/Seizure_disorders
Title: Web accessibility for seizures and physical reactions
on GitHub

• https://colortutorial.design/ (1 time) (Note! This may be a new URL 👀)
• https://colortutorial.design/hsb.html (1 time) (Note! This may be a new URL 👀)
• https://colorusage.arc.nasa.gov/flashing.php (1 time) (Note! This may be a new URL 👀)
• https://css-tricks.com/revisiting-prefers-reduced-motion-the-reduced-motion-media-query/ (1 time) (Note! This may be a new URL 👀)
• https://developer.chrome.com/blog/new-in-chrome-74/ (1 time) (Note! This may be a new URL 👀)
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• https://doi.org/10.1016/j.cub.2017.03.076 (1 time) (Note! This may be a new URL 👀)
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• https://epilepsyontario.org/musicogenic-seizures/ (1 time) (Note! This may be a new URL 👀)
• https://gist.github.com/zakirt/faa4a58cec5a7505b10e3686a226f285 (1 time) (Note! This may be a new URL 👀)
• Problems with WCAG 2.0 Flash Definition w3c/wcag#553 (1 time) (Note! This may be a new URL 👀)
• WCAG 2.1 Understanding 2.3.1 - missing/vague dimension definitions w3c/wcag#585 (1 time) (Note! This may be a new URL 👀)
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• https://www.cedars-sinai.edu/Patients/Health-Conditions/Photosensitive-Seizures.aspx (2 times) (Note! This may be a new URL 👀)
• https://www.epilepsy.com/article/2014/3/shedding-light-photosensitivity-one-epilepsys-most-complex-conditions-0 (4 times) (Note! This may be a new URL 👀)
• https://www.epilepsy.com/article/2014/4/revised-definition-epilepsy (1 time) (Note! This may be a new URL 👀)
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• https://www.epilepsy.com/start-here/about-epilepsy-basics/how-serious-are-seizures (1 time) (Note! This may be a new URL 👀)
• https://www.epilepsysociety.org.uk (1 time) (Note! This may be a new URL 👀)
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• https://www.ncbi.nlm.nih.gov/pubmed/?term=Epilepsy%20Foundation%20of%20America%20Working%20Group%5BCorporate%20Author%5D (1 time) (Note! This may be a new URL 👀)
• https://www.ncbi.nlm.nih.gov/pubmed/?term=Erba%20G%5BAuthor%5D&cauthor=true&cauthor_uid=16146438 (1 time) (Note! This may be a new URL 👀)
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• https://www.ncbi.nlm.nih.gov/pubmed/?term=Wilkins%20AJ%5BAuthor%5D&cauthor=true&cauthor_uid=16146438 (1 time) (Note! This may be a new URL 👀)
• https://www.npmjs.com/package/animated-gif-detector (1 time) (Note! This may be a new URL 👀)
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• https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/retina-image (1 time) (Note! This may be a new URL 👀)
• https://www.scientificamerican.com/article/how-the-color-red-influences-our-behavior/ (1 time) (Note! This may be a new URL 👀)
• https://www.section508.gov/content/guide-accessible-web-design-development (1 time) (Note! This may be a new URL 👀)
• https://www.smart-optometry.com/red-desaturation/ (1 time) (Note! This may be a new URL 👀)
• https://www.techrepublic.com/forums/discussions/epilepsy-and-crt-lcd-screen-flicker/ (1 time) (Note! This may be a new URL 👀)
• https://www.w3.org/TR/UNDERSTANDING-WCAG20/seizure-does-not-violate.html (3 times) (Note! This may be a new URL 👀)
• https://www.w3.org/TR/WCAG20-TECHS/C29.html (1 time) (Note! This may be a new URL 👀)
• https://www.w3.org/TR/WCAG20-TECHS/G152.html (1 time) (Note! This may be a new URL 👀)
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• https://www.w3.org/TR/css-animations-1/ (1 time) (Note! This may be a new URL 👀)
• https://www.w3.org/TR/css-transitions-1/ (1 time) (Note! This may be a new URL 👀)
• https://www.w3.org/TR/mediaqueries-4/ (1 time) (Note! This may be a new URL 👀)
• https://www.w3.org/TR/personalization-semantics-help-1.0/ (1 time) (Note! This may be a new URL 👀)
• https://www.w3.org/TR/web-animations-1/ (2 times) (Note! This may be a new URL 👀)
• https://www.w3.org/WAI/ (1 time) (Note! This may be a new URL 👀)
• https://www.w3.org/WAI/GL/low-vision-a11y-tf/ (1 time) (Note! This may be a new URL 👀)
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• https://www.w3.org/WAI/perspective-videos/contrast/ (1 time) (Note! This may be a new URL 👀)
• https://www.w3.org/WAI/standards-guidelines/wcag/new-in-21/ (1 time) (Note! This may be a new URL 👀)