Format Markdown list properly in upgrading.md (#1825)

Ensures the list is properly rendered in readthedocs website.
Improves the documentation to build and serve the docs locally.

Co-authored-by: Florian Sey <florian.sey@neofacto.com>

docs/README.md

@@ -2,9 +2,15 @@
 
 To build the AWX Operator docs locally:
 
-1. Clone the AWX operator repository. 
-2. From the root directory:
-    a.  pip install --user -r docs/requirements.txt
-    b.  mkdocs build
+1. Clone the AWX operator repository.
+1. Preferrably, create a virtual environment for installing the dependencies.  
+   a. `python3 -m venv venv`  
+   b. `source venv/bin/activate`
+1. From the root directory:  
+   a. `pip install -r docs/requirements.txt`  
+   b. `mkdocs build`
+1. View the docs in your browser:  
+   a. `mkdocs serve`  
+   b. Open your browser and navigate to `http://127.0.0.1:8000/`
 
-This will create a new directory called `site/` in the root of your clone containing the index.html and static files. To view the docs in your browser, navigate there in your file explorer and double-click on the `index.html` file. This should open the docs site in your browser.
+This will create a new directory called `site/` in the root of your clone containing the index.html and static files.