Update building.md

Author: slozier

Documentation/building.md

@@ -8,27 +8,27 @@ See [Getting the Sources](getting-the-sources.md) for information on getting the
 
 Visual Studio 2019 v16.8 or above is required to build IronPython3.
 
- * Open `c:\path\to\ironpython3\IronPython.sln` solution file
- * Select the configuration options (Release,Debug, etc)
+ * Open the `IronPython.sln` solution file
+ * Select the configuration options (Release, Debug, etc.)
  * Press Ctrl+Shift+B or F6 to build the solution
 
 ## Building from the command line
 
-IronPython3 uses PowerShell to run the build and testing from the command line. You can either use a PowerShell directly, or prefix the commands below with `powershell` on Windows, or `pwsh` on Linux/macOS. 
+IronPython3 uses PowerShell to run the build and testing from the command line. You can either use a PowerShell directly, or prefix the commands below with `powershell` on Windows, or `pwsh` on Linux/macOS.
 
 On Linux/macOS you will need to install [PowerShell](https://github.com/PowerShell/PowerShell/releases)
 
 Change the working directory to the path where you cloned the sources and run `./make.ps1`
 
-By default, with no options, make.ps1 will build Release mode binaries. If you would like to build debug binaries, you can run `./make.ps1 debug`
+By default, with no options, `make.ps1` will build the `Release` mode binaries. If you would like to build `Debug` binaries, you can run `./make.ps1 debug`
 
 Other options available for `make.ps1` are
 
 ```
 -configuration (debug/release)   The configuration to build for
 -platform (x86/x64)              The platform to use in running tests
 -runIgnored                      Run tests that are marked as ignored in the .ini manifests
--frameworks                      A comma separated list of frameworks to run tests for 
+-frameworks                      A comma separated list of frameworks to run tests for
                                  (use nomenclature as is used in msbuild files for TargetFrameworks)
 ```
 
@@ -37,12 +37,14 @@ There are also other targets available for use with packaging and testing, most
 ```
 package                         Creates packages supported by the current platform
 stage                           Stages files ready for packaging
-test-*                          Runs tests from `all` categories, `ironpython` specific tests, 
+test-*                          Runs tests from `all` categories, `ironpython` specific tests,
                                 `cpython` tests from the CPython stdlib test suite
 ```
 
 If the build is successful the binaries are stored in `ironpython3/bin/{Configuration}/{TargetFramework}`.
 
-## Run
+## Running
 
-Before run the IronPython3, you should set the environment variable `IRONPYTHONPATH` to `Src/StdLib/Lib/`.
+The standard library is not copied over to the `bin` folder during the build process, it lives in `Src/StdLib/Lib`.
+- When running the `Release` configuration executable, you should set the environment variable `IRONPYTHONPATH` to this folder.
+- When running the `Debug` configuration executable, this folder is automatically added to `sys.path`.