Update durable-functions-dotnet-isolated-overview.md

[shibayan]

This pull request includes a small but important change to the articles/azure-functions/durable/durable-functions-dotnet-isolated-overview.md file. The change updates a link to ensure it points to the correct documentation for migrating to the .NET isolated model.

Documentation update:

• articles/azure-functions/durable/durable-functions-dotnet-isolated-overview.md: Updated the link for migrating to the .NET isolated model from ../migrate-version-3-version-4.md to ../migrate-dotnet-to-isolated-model.md.

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[Court72]

@jviau

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

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