You need to go to your local version of sympy/doc and issue 'make html'. This will make the entire docs in html. You will then view the newly made docs using (my path is shown of course):

open /Users/comerduncan/Sandbox/sympy/doc/_build/html/index.html

Note that I am using a Macbook Pro (circa 2011) with Mavericks installed.  Also, you need to make sure that all needed software supporting sphinx is installed. And I use MathJax to do the rendering on the latex which occurs when I run the above open ... 

Hope this helps.