fix: remove useless escape characters in pattern

[ArmandPhilippot]

Description (required)

To avoid confusion whether the editor automatically removes the character or ESlint displays a warning, I removed the useless escape character in the loader pattern.

Related issues & labels (optional)

• Related:
  • Update to v5 Legacy content collections section #10152
  • https://discord.com/channels/830184174198718474/853350631389265940/1314275896038785227
• Suggested label: code snippet update

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[sarah11918]

I'm always fixing links, you're always fixing code examples.... 😄