Include nox install instructions in Getting Started dev doc (#12001)

Author: awitghirmai

docs/html/development/getting-started.rst

@@ -27,32 +27,42 @@ Development Environment
 pip is a command line application written in Python. For developing pip,
 you should `install Python`_ on your computer.
 
-For developing pip, you need to install :pypi:`nox`. Often, you can run
-``python -m pip install nox`` to install and use it.
+For developing pip, you need to install :pypi:`nox`. The full development setup would then be:
 
+.. tab:: Unix/macOS
+
+    .. code-block:: shell
+
+        python -m venv .venv
+        source .venv/bin/activate
+        python -m pip install nox
+
+.. tab:: Windows
+
+    .. code-block:: shell
+
+        py -m venv .venv
+        .venv\Scripts\activate
+        py -m pip install nox
 
 Running pip From Source Tree
 ============================
 
 To run the pip executable from your source tree during development, install pip
 locally using editable installation (inside a virtualenv).
-You can then invoke your local source tree pip normally.
+You can then invoke your local source tree pip normally (be sure virtualenv is active).
 
 .. tab:: Unix/macOS
 
     .. code-block:: shell
 
-        python -m venv .venv
-        source .venv/bin/activate
         python -m pip install -e .
         python -m pip --version
 
 .. tab:: Windows
 
     .. code-block:: shell
 
-        py -m venv .venv
-        .venv\Scripts\activate
         py -m pip install -e .
         py -m pip --version
 

news/no-issue.trivial.rst

@@ -0,0 +1,2 @@
+Added seperate instructions for installing ``nox`` in the ``docs/development/getting-started.rst`` doc. and slight update
+to the below ``Running pip From Source Tree`` section.