Added pyvenv docs to 'Python Setup and Usage' section.
diff --git a/Doc/using/index.rst b/Doc/using/index.rst
index 1201153..502afa9 100644
--- a/Doc/using/index.rst
+++ b/Doc/using/index.rst
@@ -17,4 +17,4 @@
    unix.rst
    windows.rst
    mac.rst
-
+   scripts.rst