Fix typo in NU5104 doc (#3314)

Author: andreycha

docs/reference/errors-and-warnings/NU5104.md

@@ -23,4 +23,4 @@ The project or nuspec being packaged contains a dependency on a prerelease packa
 If you intend to create a prerelease package then please refer to SemVer2 guidelines and add a prerelease tag to the version property i.e. `<version>1.0.0-pre</version>`. If you intend to create a stable package then please update the specified dependency version to a stable version.
 
 > [!NOTE]
-> Mixing stable and prerelease packages may lead to unexpected behaviors are resolution time. Learn more about how [PackageReference](../../concepts/Dependency-Resolution.md#version-ranges-and-prerelease-versions-with-packagereference) and [packages.config](../../concepts/Dependency-Resolution.md#version-ranges-and-prerelease-versions-with-packagesconfig) projects handle this resolution.
+> Mixing stable and prerelease packages may lead to unexpected behaviors at resolution time. Learn more about how [PackageReference](../../concepts/Dependency-Resolution.md#version-ranges-and-prerelease-versions-with-packagereference) and [packages.config](../../concepts/Dependency-Resolution.md#version-ranges-and-prerelease-versions-with-packagesconfig) projects handle this resolution.