doc: fix README.rst install instructions render

Signed-off-by: Dasun Abeykoon <Dasun20202020@hotmail.com>

Author: dabeycorn

README.rst

@@ -44,28 +44,28 @@ Independent Installation
 ------------------------
 You can also install ``diffpy.distanceprinter`` independently for yourself.
 
-Assuming you have a wheel file in the current working directory, in an active conda environment please type
+Assuming you have a wheel file in the current working directory, in an active conda environment please type ::
 
     pip install ./diffpy.distanceprinter-VERSION.whl
 
 where you replace VERSION with the actual version you have so the command matches the filename of the
 wheel file you have.
 
-The commands to create and activate the conda environment with name "distanceprinter-env" is
+The commands to create and activate the conda environment with name "distanceprinter-env" is ::
 
     conda create -n distanceprinter-env python=3.13
     conda activate distanceprinter-env
 
 If you don't have conda installed, we recomment you install `miniconda
 <https://docs.conda.io/projects/miniconda/en/latest/miniconda-install.html>`_
-To install this software from a Python wheel distribution format execute
+To install this software from a Python wheel distribution format execute ::
 
     pip install ./diffpy.distanceprinter-VERSION.whl
 
 If you are a developer, you can also install this package from sources. First, obtain the source archive
 from `GitHub <https://github.com/diffpy/diffpy.distanceprinter/>`_.
 Install the packages in ``./requirements/conda.txt`` and ``./requirements/tests.txt``
-using the `--file`` command:
+using the `--file`` command ::
 
     conda activate distanceprinter-env
     conda install --file ./requirements/conda.txt