Additional refinement

- add aditional information about cmd.exe
- use $env:Userprofile where appropriate
- add --use-no-pep517 to the windows instruction
- add some syntax highlight

Relevant issue pandas-dev#29113

Author: Georgi Baychev

doc/source/development/contributing.rst

@@ -240,7 +240,7 @@ You'll need to have at least python3.5 installed on your system.
 
 **Unix**/**Mac OS**
 
-.. code-block:: none
+.. code-block:: bash
 
    # Create a virtual environment
    # Use an ENV_DIR of your choice. We'll use ~/virtualenvs/pandas-dev
@@ -260,25 +260,30 @@ You'll need to have at least python3.5 installed on your system.
 **Windows**
 
 Below is a brief overview on how to set-up a virtual environment with Powershell
-under Windows. For details please refer to the \
+under Windows. For details please refer to the 
 `official virtualenv user guide <https://virtualenv.pypa.io/en/stable/userguide/#activate-script>`__
 
-.. code-block:: none
+.. code-block:: powershell
 
    # Create a virtual environment
-   # Use an ENV_DIR of your choice. We'll use ~\virtualenvs\pandas-dev
+   # Use an ENV_DIR of your choice. We'll use ~\virtualenvs\pandas-dev where
+   # '~' is the folder pointed to by either $env:USERPROFILE (Powershell) or 
+   # %USERPROFILE% (cmd.exe) environment variable
    # Any parent directories should already exist
-   python -m venv ~\virtualenvs\pandas-dev
+
+   # If you are using cmd.exe, run instead: python -m venv $env:USERPROFILE\virtualenvs\pandas-dev
+   python -m venv $env:USERPROFILE\virtualenvs\pandas-dev 
 
    # Activate the virtualenv
-   ~\virtualenvs\pandas-dev\Scripts\Activate.ps1
+   # If you are using cmd.exe, run instead: %USERPROFILE%\virtualenvs\pandas-dev\Scripts\activate.bat
+   ~\virtualenvs\pandas-dev\Scripts\Activate.ps1 
 
    # Install the build dependencies
    python -m pip install -r requirements-dev.txt
 
    # Build and install pandas
    python setup.py build_ext --inplace -j 4
-   python -m pip install -e . --no-build-isolation
+   python -m pip install -e . --no-build-isolation --no-use-pep517
 
 Creating a branch
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