Update Icon a11y docs to specify 3:1 contrast ratio

[nishasy]

Summary:

Turns out that icons can have a 3:1 contrast ratio, and
the article I initially used to say 4.5:1 misinterpreted
the spec. Thanks to Sarah B for pointing this out!

More info:
https://khanacademy.slack.com/archives/C8Z9DSKC7/p1700588780588889

Issue: non

Test plan:

• Go to http://localhost:6061/?path=/docs/icon-accessibility--docs
• Confirm that the docs say 3:1 now
• Confirm that the new W3 reference navigates to the correct
  article.

[changeset-bot]

🦋 Changeset detected

Latest commit: 608ed82

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 0 packages

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[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/wonder-blocks for changes to .changeset/slow-pigs-sip.md, __docs__/wonder-blocks-icon/accessibility.stories.mdx

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[github-actions]

Size Change: 0 B

Total Size: 90.9 kB

ℹ️ View Unchanged

Filename	Size
packages/wonder-blocks-accordion/dist/es/index.js	3.69 kB
packages/wonder-blocks-banner/dist/es/index.js	1.53 kB
packages/wonder-blocks-birthday-picker/dist/es/index.js	1.72 kB
packages/wonder-blocks-breadcrumbs/dist/es/index.js	1.13 kB
packages/wonder-blocks-button/dist/es/index.js	4.27 kB
packages/wonder-blocks-cell/dist/es/index.js	2.19 kB
packages/wonder-blocks-clickable/dist/es/index.js	3.24 kB
packages/wonder-blocks-color/dist/es/index.js	1.15 kB
packages/wonder-blocks-core/dist/es/index.js	3.67 kB
packages/wonder-blocks-data/dist/es/index.js	6.33 kB
packages/wonder-blocks-dropdown/dist/es/index.js	12 kB
packages/wonder-blocks-form/dist/es/index.js	5.34 kB
packages/wonder-blocks-grid/dist/es/index.js	1.36 kB
packages/wonder-blocks-i18n/dist/es/index.js	4.54 kB
packages/wonder-blocks-icon-button/dist/es/index.js	3.21 kB
packages/wonder-blocks-icon/dist/es/index.js	1.06 kB
packages/wonder-blocks-labeled-field/dist/es/index.js	72 B
packages/wonder-blocks-layout/dist/es/index.js	1.88 kB
packages/wonder-blocks-link/dist/es/index.js	2.54 kB
packages/wonder-blocks-modal/dist/es/index.js	5.04 kB
packages/wonder-blocks-pill/dist/es/index.js	1.03 kB
packages/wonder-blocks-popover/dist/es/index.js	4.33 kB
packages/wonder-blocks-progress-spinner/dist/es/index.js	1.51 kB
packages/wonder-blocks-search-field/dist/es/index.js	1.55 kB
packages/wonder-blocks-spacing/dist/es/index.js	158 B
packages/wonder-blocks-switch/dist/es/index.js	2.06 kB
packages/wonder-blocks-testing/dist/es/index.js	3.94 kB
packages/wonder-blocks-theming/dist/es/index.js	1.21 kB
packages/wonder-blocks-timing/dist/es/index.js	1.78 kB
packages/wonder-blocks-toolbar/dist/es/index.js	862 B
packages/wonder-blocks-tooltip/dist/es/index.js	5.05 kB
packages/wonder-blocks-typography/dist/es/index.js	1.49 kB

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[codecov]

Codecov Report

Merging #2133 (608ed82) into main (9092363) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2133   +/-   ##
=======================================
  Coverage   97.05%   97.05%           
=======================================
  Files         241      241           
  Lines       28038    28038           
  Branches     2464     2381   -83     
=======================================
  Hits        27212    27212           
  Misses        826      826           

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[github-actions]

A new build was pushed to Chromatic! 🚀

https://5e1bf4b385e3fb0020b7073c-cqgvqeagee.chromatic.com/

Chromatic results:

Metric	Total
Captured snapshots	0
Tests with visual changes	0
Total stories	388
Inherited (not captured) snapshots [TurboSnap]	316
Tests on the build	316

[github-actions]

npm Snapshot: Published

🎉 Good news!! We've packaged up the latest commit from this PR (28d0413) and published all packages with changesets to npm.

You can install the packages in webapp by running:

./services/static/dev/tools/deploy_wonder_blocks.js --tag="PR2133"

Packages can also be installed manually by running:

yarn add @khanacademy/wonder-blocks-<package-name>@PR2133

[jeresig]

Ah great, thank you!