Fix minor typo in ASP.NET Core tutorials

[Bonfire]

Found a one-character typo while browsing the docs. Please feel free to close/modify this PR if you believe this change is not needed. Thank you.

[DanBuild]

Failed to build the site :(

Failed during stage 'building site': Build script returned non-zero exit code: 1

Build log: https://app.netlify.com/sites/reactnet/deploys/626771bca2c973000914dc97

[dustinsoftware]

Thanks. No idea why the main docs build is broken, maybe we need to pin a dep or update the netlify config ….

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