Updated build instructions

Author: mstfbl

docs/building/netcoreapp3.1-instructions.md

@@ -5,8 +5,8 @@ ML.NET source code files build for .NET Core 3.1 and .NET Standard 2.0. However,
 
 To run tests on .NET Core 3.1, you need to do a few manual steps.
 
-1. Run `.\build.cmd -- /p:Configuration=Release-netcoreapp3_1` or `.\build.cmd -Release-netcoreapp3_1` from the root of the repo.
-2. If you want to build the NuGet packages, `.\build.cmd -buildPackages` after step 1.
+1. Run `.\build.cmd -configuration Debug-netcoreapp3_1` or `.\build.cmd -configuration Release-netcoreapp3_1` from the root of the repo.
+2. If you want to build the NuGet packages, `.\build.cmd -pack` after step 1.
 
 If you are using Visual Studio, you will need to do the following:
 

docs/building/unix-instructions.md

@@ -48,7 +48,7 @@ On macOS a few components are needed which are not provided by a default develop
 * libomp 7
 * libgdiplus
 * gettext
-* All the requirements necessary to run .NET Core 3.1 applications. To view macOS prerequisites click [here](https://docs.microsoft.com/en-us/dotnet/core/macos-prerequisites?tabs=netcore30).
+* All the requirements necessary to run .NET Core 3.1 applications. To view macOS prerequisites click [here](https://docs.microsoft.com/en-us/dotnet/core/install/macos?tabs=netcore31#dependencies).
 
 One way of obtaining CMake and other required libraries is via [Homebrew](https://brew.sh):
 ```sh

docs/building/windows-instructions.md

@@ -56,8 +56,8 @@ You can use the Developer Command Prompt, Powershell or work in any regular cmd.
 From a (non-admin) Command Prompt window:
 
 - `build.cmd` - builds the assemblies
-- `build.cmd -runTests` - called after a normal "build.cmd" will run all tests
-- `build.cmd -buildPackages` called after a normal “build.cmd” will create the NuGet packages with the assemblies in “bin"
+- `build.cmd -test` - called after a normal "build.cmd" will run all tests
+- `build.cmd -pack` called after a normal “build.cmd” will create the NuGet packages with the assemblies in `artifacts\packages`"
 
 **Note**: Before working on individual projects or test projects you **must** run `build.cmd` from the root once before beginning that work. It is also a good idea to run `build.cmd` whenever you pull a large set of unknown changes into your branch.
 
@@ -69,7 +69,7 @@ After successfully building, run tests in the Visual Studio Test Explorer window
 
 ### Running tests from the command line
 
-From the root, run `build.cmd` and then `build.cmd -runTests`.
+From the root, run `build.cmd` and then `build.cmd -test`.
 For more details, or to test an individual project, you can navigate to the test project directory and then use `dotnet test`
 
 ## Known Issues