fix: use correct camelCase slugs for GraphQL card links

[devin-ai-integration]

Summary

Fix broken card links on the GraphQL API Reference overview page. The card hrefs used hyphenated slugs (get-plant, create-plant, order-placed) but GraphQL operation slugs preserve camelCase from the schema (getPlant, createPlant, orderPlaced).

Review & Testing Checklist for Human

• After merging and republishing, verify the three cards on https://graphql.docs.buildwithfern.com/api-reference link to valid pages

Notes

The correct URLs were verified against the live site before this fix.

Link to Devin session: https://app.devin.ai/sessions/6ec297a50749439ab276ea17ccd914d7
Requested by: @devalog

[devin-ai-integration]

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