Updated C#/.NET compatibility tables. (DOCS-11023)

[rob-mongodb]

Staged at https://docs-mongodbcom-staging.corp.mongodb.com/ecosystem/robertjustice/DOCS-11023/drivers/csharp.html.

[schmalliso]

Because the compatibility tables are weird, you also need to update the tables in/drivers/driver-compatibility-reference, which contain all of the driver versions, not just the ones we talk about these days.

[rob-mongodb]

@schmalliso , good catch! Staging is updated and ready for another look.

[schmalliso]

This isn't appearing on staging, currently -- not sure why. Assuming it does build correctly, LGTM!

[schmalliso]

One comment - LGTM assuming it all builds correctly!

[rob-mongodb]

@jyemin , this small update is ready for a technical review.

[jyemin]

After discussing with @rstam, we decided it would be good to explicitly mention all the versions of .NET Core, as we do with .NET Framework. So the table would look like:

Driver Version ...        .NET Core 1.0 | .NET Core 1.1 | .NET Core 2.0
2.4                                x    |         x     |        x 
2.3                                x    |         x     |        x 

[rob-mongodb]

@jyemin , staging is updated and ready for another look.

[jyemin]

One small change to the table.

Also noticed in the rendered view that the second table, now that it has six columns, is cut off on the right no matter how wide my Chrome window is, and I have to horizontally scroll to see the full text of the rightmost header.

[jyemin]

Re-order so that 1.0 is before 1.1

[rob-mongodb]

@jyemin , staging is updated and ready for another look.

[rob-mongodb]

@kay-kim , this is ready for merge into 3.6 and master.