docs(typography): rename token headings

[denkristoffer]

Purpose of PR

Rename token headings in the typography docs to fix links. See the changes here: https://forma-36-git-docs-token-headings.colorfuldemo.com/tokens/typography

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Name	Status	Preview	Updated (UTC)
forma-36	✅ Ready (Inspect)	Visit Preview	Jun 28, 2024 9:17am

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Latest commit: 9ec73eb

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[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
CommonJS	135.83 KB (0%)	2.8 s (0%)	144 ms (+54.72% 🔺)	2.9 s
Module	132.08 KB (0%)	2.7 s (0%)	132 ms (+2.83% 🔺)	2.8 s