Update typography.md

[nataliafitzgerald]

Removed black text on gray from partially accessible combinations. This is not something we want to recommend. Also made some updates to the color names to align with our current color palette. @Scotchester Feel free to tweak as needed.

Additions

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Removals

• Remove black text on gray on gray from partially accessible combinations.

Changes

• Updates to color names to align with our current color palette.
• Text updates for the sake of clarity
• Reordering of the different color combinations so that they follow a consistent pattern

Testing

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Review

• @Scotchester

Preview this PR without the whitespace changes

Screenshots

Notes

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Todos

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Checklist

• [ ] Changes are limited to a single goal (no scope creep)
• [ ] Code can be automatically merged (no conflicts)
• [ ] Code follows the standards laid out in the front end playbook
• [ ] Passes all existing automated tests
• [ ] New functions include new tests
• [ ] New functions are documented (with a description, list of inputs, and expected output)
• [ ] Placeholder code is flagged
• [ ] Visually tested in supported browsers and devices
• [ ] Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)

[jimmynotjim]

This looks good, I'm assuming we can merge it? cc @Scotchester