Fix typo in Create.md

[rkfg]

Problem

Typo in the notification translation key

Solution

The correct key is created, not create according to

react-admin/packages/ra-core/src/controller/create/useCreateController.ts

Line 99 in 440f71f

notify(`resources.${resource}.notifications.created`, {

How To Test

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Additional Checks

• The PR targets master for a bugfix or a documentation fix, or next for a feature
• The PR includes unit tests (if not possible, describe why)
• The PR includes one or several stories (if not possible, describe why)
• The documentation is up to date

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[djhi]

Indeed, thanks!