This is how to edit reStrucuturedText (rst) files in Pycharm 4. First install docutils in your Python environment:
pip install docutils
Next, from the Pycharm menu bar select: Run>Edit Configurations. Add a Python docs>Docutils task. Then fill in the form as follows:
When you run this, it will convert your file to HTML. Under the View menu there is a menu item to display the HTML in a browser.
Also, rst does not like hard returns. This means that paragraphs have to be a long line. I tried setting up the editor for soft wraps but I found it more difficult to write Python code.