RDoc-3116 & RDoc-3117 Client API > Commands [Fix articles] (C# & Node.js)

[Danielle9897]

Related issues:
https://issues.hibernatingrhinos.com/issue/RDoc-3116/C-Client-API-Commands-Fix-articles
https://issues.hibernatingrhinos.com/issue/RDoc-3117/Node.js-Client-API-Commands-Fix-articles

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This PR fixes the commands articles for C# & Node.js
Java & Python articles were only copied over to the folder - and still need to be fixed (see this meta issue)

Note: All samples in this PR have been run and tested.

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@ml054 Node.js files to review:

**Commands overview:**
Documentation/6.0/Raven.Documentation.Pages/client-api/commands/overview.js.markdown
Documentation/6.0/Samples/nodejs/client-api/commands/documents/overview.js
**Put document:**
Documentation/6.0/Raven.Documentation.Pages/client-api/commands/documents/put.js.markdown
Documentation/6.0/Samples/nodejs/client-api/commands/documents/put.js
**Get documents:**
Documentation/6.0/Raven.Documentation.Pages/client-api/commands/documents/get.js.markdown
Documentation/6.0/Samples/nodejs/client-api/commands/documents/get.js
**Delete document:**
Documentation/6.0/Raven.Documentation.Pages/client-api/commands/documents/delete.js.markdown
Documentation/6.0/Samples/nodejs/client-api/commands/documents/delete.js
**Send multiple commands:**
Documentation/6.0/Raven.Documentation.Pages/client-api/commands/batches/how-to-send-multiple-commands-using-a-batch.js.markdown
Documentation/6.0/Samples/nodejs/client-api/commands/batches/sendMultipleCommands.js

@aviv C# files to review:

**Commands overview:**
Documentation/6.0/Raven.Documentation.Pages/client-api/commands/overview.dotnet.markdown
Documentation/6.0/Samples/csharp/Raven.Documentation.Samples/ClientApi/Commands/Documents/Overview.cs
**Put document:**
Documentation/6.0/Raven.Documentation.Pages/client-api/commands/documents/put.dotnet.markdown
Documentation/6.0/Samples/csharp/Raven.Documentation.Samples/ClientApi/Commands/Documents/Put.cs
**Get documents:**
Documentation/6.0/Raven.Documentation.Pages/client-api/commands/documents/get.dotnet.markdown
Documentation/6.0/Samples/csharp/Raven.Documentation.Samples/ClientApi/Commands/Documents/Get.cs
**Delete document:**
Documentation/6.0/Raven.Documentation.Pages/client-api/commands/documents/delete.dotnet.markdown
Documentation/6.0/Samples/csharp/Raven.Documentation.Samples/ClientApi/Commands/Documents/Delete.cs
**Send multiple commands:**
Documentation/6.0/Raven.Documentation.Pages/client-api/commands/batches/how-to-send-multiple-commands-using-a-batch.dotnet.markdown
Documentation/6.0/Samples/csharp/Raven.Documentation.Samples/ClientApi/Commands/Batches/SendMultipleCommands.cs