docs: fix async map anchor links in README

[victorpoughon]

Currently, the link in the README outline to ResultAsync.map is broken: it links to Result.asyncMap.

This is because GitHub markdown automatically creates anchor IDs for headings by lower-casing and stripping down the heading text of any non alphanumeric characters. So Result.asyncMap and ResultAsync.map reduce to the same anchor ID.

This gives each heading a unique anchor ID to fix the link.

[changeset-bot]

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Latest commit: 1cb9f2a

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