docs: add new troubleshooting section for create-medusa-app

[shahednasser]

Added new troubleshooting section for create-medusa-app related to running port

[changeset-bot]

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Latest commit: 0a19865

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Name	Status	Preview	Comments	Updated (UTC)
api-reference	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 15, 2024 11:17am
docs-ui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 15, 2024 11:17am
medusa-dashboard	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 15, 2024 11:17am
medusa-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 15, 2024 11:17am