Fix airflow.utils.context.Context import path in Airflow 3 migration doc

[roykoand]

Fix airflow.utils.context.Context import path in Airflow 3 migration documentation. It appears to have been mistakenly written as airflow.models.context.Context.

Please refer to apache-airflow-providers-common-compat:

airflow/providers/common/compat/src/airflow/providers/common/compat/sdk.py

Line 208 in cf80ae1

"Context": ("airflow.sdk", "airflow.utils.context"),

---

^ Add meaningful description above
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[boring-cyborg]

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