Fix the docs for building and running CoreCLR csc

docs/compilers/Building for Core CLR.md

 Building CoreCLR Csc & Vbc
 =================================================
 
-The compiler projects included in all the solution files currently target only
-the desktop framework. If you want to build a version of each exe compatible
-with CoreCLR, there are two separate projects:
-* [CscCore](../../src/Compilers/CSharp/CscCore/CscCore.csproj)
-* [VbcCore](../../src/Compilers/VisualBasic/VbcCore/VbcCore.csproj)
+First, build Roslyn.sln as described in https://github.com/dotnet/roslyn/wiki/Building-Testing-and-Debugging.
 
-To build these projects, first execute `powershell .nuget\NuGetRestore.ps1`
-from the root of your clone to restore NuGet packages, and then execute `msbuild`
-on the command line with the path to each of the projects.
-
-When you build CscCore or VbcCore the binaries will be output to the core-clr
-subdirectory in the output directory. However, by default the executables will
-still run on the desktop runtime. To run on the CoreCLR console host, run the
-powershell script 
+The Core CLR-compatible csc.exe and vbc.exe willl be placed in the core-clr subdirectory in the output directory. However, by default the executables will still run on the desktop runtime. To run on the CoreCLR console host, run the powershell script 
 [src/Tools/CopyCoreClrRuntime/CopyCoreClrRuntime.ps1](../../src/Tools/CopyCoreClrRuntime/CopyCoreClrRuntime.ps1) 
 with the path to the output directory as the parameter.
 
@@ -24,5 +13,5 @@ If you then wish to dogfood the CoreCLR copmilers while developing Roslyn then s
 the BootstrapBuildPath environment variable (or at the MSBuild command line) to 
 point to the core-clr directory.
 
-> msbuild /p:BootstrapBuildPath=<path-to-core-clr-dir>
+> msbuild /p:BootstrapBuildPath='path-to-core-clr-dir'