chore: change "functional components" to "function components" (to be consistent with react.dev)

Signed-off-by: REL1CX <[email protected]>

Author: Rel1cx

apps/website/content/docs/migration.mdx

@@ -30,7 +30,7 @@ However, not all rules have direct equivalents, and some behave differently.
 - ⚠️ **Warning** - Rule has been deprecated in `eslint-plugin-react`
 
 A variety of rules are marked **legacy**, but still have equivalent rules. This distinction was done to more accurately assess
-migration for React written with functional components and no longer use `propTypes`.
+migration for React written with function components and no longer use `propTypes`.
 
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