[DOC]: params & units guidelines in contributing page

docs/sphinx/source/contributing/how_to_contribute_new_code.rst

@@ -153,8 +153,7 @@ We strongly recommend using virtual environments for development.
 Virtual environments make it easier to switch between different
 versions of software. This `scientific-python.org guide
 <https://learn.scientific-python.org/development/tutorials/dev-environment/>`_
-is a good reference for virtual environments. The pvlib-python `installation
-user guide <https://pvlib-python.readthedocs.io/en/stable/user_guide/
-installation.html#set-up-a-virtual-environment>`_ also provides instructions on
+is a good reference for virtual environments. The pvlib-python
+:ref:`installation guide <setupenvironment>` also provides instructions on
 setting up a virtual environment. If this is your first pull request, don't
 worry about using a virtual environment.

docs/sphinx/source/contributing/style_guide.rst

@@ -70,6 +70,26 @@ the ``docs/readthedocs.org:pvlib-python`` link within the checks
 status box at the bottom of the pull request.
 
 
+.. _documentation-units:
+
+Parameter names and units
+-------------------------
+
+When specifying parameters and their units, please follow these guidelines:
+
+- Use the recommended parameter name and units by :ref:`variables_style_rules` where possible.
+- Enclose units in square brackets, e.g. ``[W]``.
+- Use unicode superscripts symbols for exponents, e.g. ``m²``.
+
+  These superscripts characters are ``⁰``, ``¹``, ``²``, ``³``, ``⁴``, ``⁵``, ``⁶``, ``⁷``, ``⁸``, ``⁹``, ``⁻``. Degree symbol is ``°``.
+
+- Link to a brief description in the :ref:`variables_style_rules` section if it exists, via the sphinx role ``:term:`glossary_term```. For example, to document ``dni`` use:
+
+  .. code-block:: rst
+
+      dni : numeric
+          Direct normal irradiance, see :term:`dni`. [Wm⁻²]
+
 .. _building-the-documentation:
 
 Building the documentation

docs/sphinx/source/reference/tracking.rst

@@ -3,9 +3,6 @@
 Tracking
 ========
 
-Functions
----------
-
 .. autosummary::
    :toctree: generated/
 

docs/sphinx/source/reference/transformer.rst

@@ -3,7 +3,7 @@
 Transformer losses
 ==================
 
-Methods to account for losses in transformers
+Functions to account for losses in transformers
 
 .. autosummary::
    :toctree: generated/