Rename Documents DB to DXDocs

[AlexanderSkogorev]

Looks like that Documents.mdf from the 'aspnet-office-solutions\Azure-SessionAffinity-Starter\src\Database' originally was named DXDocs.mdf. Because of renaming it is not possible to attach the mdf to the local DB. Also it would be much better to include an initialization script, not the mdf files, because I don't see a way to deploy the mdf file to the Azure directly.

Summary:
When I try to attach the Documents.mdf - I'm getting the following error: 'Unable to open the physical fileOperating system error 5'. To solve this I renamed the file to DXDocs.mdf.

Please rename the file at the repository, or prepare a correct mdf file which name will actually be Documents.mdf, or just remove mdf files and give us an initialization scripts.