6.1.0 .NET API doc generation has warnings

[cheenamalhotra]

Ref PR: https://github.com/dotnet/sqlclient-api-docs/pull/87

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sqlclient-api-docs/xml/Microsoft.Data.SqlClient/SqlCommand.xml
Line 0, Column 0: [Warning: xref-not-found - See documentation] Cross reference not found: 'Microsoft.Data.SqlTypes.SqlVector*'.

sqlclient-api-docs/xml/Microsoft.Data.SqlClient/SqlDataAdapter.xml
Line 0, Column 0: [Warning: xref-not-found - See documentation] Cross reference not found: 'Microsoft.Data.SqlClient.SqlDataAdapter.OnRowUpdating(System.Data.Common.RowUpdatingEventArgs)'.
Line 0, Column 0: [Warning: xref-not-found - See documentation] Cross reference not found: 'Microsoft.Data.SqlClient.SqlDataAdapter.OnRowUpdated(System.Data.Common.RowUpdatedEventArgs)'.
Line 0, Column 0: [Warning: xref-not-found - See documentation] Cross reference not found: 'Microsoft.Data.SqlClient.SqlDataAdapter.OnRowUpdating(System.Data.Common.RowUpdatingEventArgs)'.
Line 0, Column 0: [Warning: xref-not-found - See documentation] Cross reference not found: 'Microsoft.Data.SqlClient.SqlDataAdapter.OnRowUpdated(System.Data.Common.RowUpdatedEventArgs)'.

sqlclient-api-docs/xml/Microsoft.Data.SqlClient/SqlDataReader.xml
Line 0, Column 0: [Warning: xref-not-found - See documentation] Cross reference not found: 'Microsoft.Data.SqlTypes.SqlVector'.
Line 0, Column 0: [Warning: xref-not-found - See documentation] Cross reference not found: 'Microsoft.Data.SqlTypes.SqlVector'.
Line 0, Column 0: [Warning: xref-not-found - See documentation] Cross reference not found: 'Microsoft.Data.SqlTypes.SqlVector'.

For more details, please refer to the build report.