Update quickstart for revised temepst init setup

This commit updates the quickstart to reflect reality when using
tempest init. The quickstart documented our original ideal expectation
of how things worked, but because of python packaging limitations we
had to adjust it's behavior. However, the quickstart was never updated
to reflect this change.

Change-Id: Icbc0c005a344c25b7ab7d3fd059a9401747eca3f
Closes-Bug: #1598882
diff --git a/README.rst b/README.rst
index fe65dcd..b44df65 100644
--- a/README.rst
+++ b/README.rst
@@ -63,12 +63,14 @@
    This can be done within a venv, but the assumption for this guide is that
    the Tempest cli entry point will be in your shell's PATH.
 
-#. Installing Tempest will create a /etc/tempest dir which will contain the
-   sample config file packaged with Tempest. The contents of /etc/tempest will
-   be copied to all local working dirs, so if there is any common configuration
-   you'd like to be shared between anyone setting up local Tempest working dirs
-   it's recommended that you copy or rename tempest.conf.sample to tempest.conf
-   and make those changes to that file in /etc/tempest
+#. Installing Tempest may create a /etc/tempest dir, however if one isn't
+   created you can create one or use ~/.tempest/etc or ~/.config/tempest in
+   place of /etc/tempest. If none of these dirs are created tempest will create
+   ~/.tempest/etc when it's needed. The contents of this dir will always
+   automatically be copied to all etc/ dirs in local workspaces as an initial
+   setup step. So if there is any common configuration you'd like to be shared
+   between local Tempest workspaces it's recommended that you pre-populate it
+   before running ``tempest init``.
 
 #. Setup a local Tempest workspace. This is done by using the tempest init
    command::