[Feature] Update topics that are using explicit dotnet restore

[BillWagner]

Many (maybe all?) of our .NET Core tutorials tell users to explicitly run dotnet restore. That's no longer necessary. dotnet restore will be run implicitly on dotnet build or dotnet run.

All our tutorials and samples need to be updated to reflect this change.

Note that this will include the tutorials in the C# Guide, and the F# Guide.

[isaacrlevin]

@BillWagner @mairaw is the goal here to simply remove the reference to dotnet restore or add a note to every page (13 files total based on a search) that this is no longer required with .Net Core 2.0?

[BillWagner]

@isaac2004 I'd prefer adding a note. dotnet restore is still a valid command, and there are scenarios (like some CI builds) where doing an explicit restore makes sense.

[isaacrlevin]

@BillWagner How about adding to this to all the references?

Note: As of Dot Net Core 2.0, it is not necessary to run dotnet restore becase it is run implicitly as part of dotnet build or dotnet run. It is still a valid command in certain scenarios where doing an explicit restore makes sense. One example being continuous integration builds in Visual Studio Team Services.

[BillWagner]

@isaac2004 Perfect!

[isaacrlevin]

@BillWagner, sweet... expect a PR in about an hour

[mairaw]

Thanks @isaac2004.

We usually say "Starting with .NET Core 2.0," so it's future-proof.
The other thing I wanted to do is to indicate the dotnet restore is optional in certain tutorials. For an example, see PR #3170.

[isaacrlevin]

@mairaw should we be adding the note in this issue in ALL docs that reference dotnet restore (so updating the text in #3170)?