[pygobject] Link to the dev environment page

[Christoph Reiter <creiter src gnome org>]

commit 41e4524c71eb5cbbb0fcca640596cf38d1bd31f6
Author: Dan Yeaw <dan yeaw me>
Date:   Tue Mar 6 22:45:36 2018 -0500

    Link to the dev environment page
    
    Signed-off-by: Dan Yeaw <dan yeaw me>

 docs/getting_started.rst | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/docs/getting_started.rst b/docs/getting_started.rst
index fe2a6a44..f07eb1c7 100644
--- a/docs/getting_started.rst
+++ b/docs/getting_started.rst
@@ -126,3 +126,7 @@ dependencies are present yourself as pip will only take care of pycairo.
     source myvenv/bin/activate
     pip install pygobject
     python hello.py
+
+
+For more details on how to use a virtualenv with PyGObject, see the
+":ref:`devenv`" page.