Add warning for copying/replacing conf.py in Guide for Testing One Project

Issue-ID: DOC-651
Change-Id: I4f7a55b6e622598b746332aa5d8d7b88607ccefc
Signed-off-by: JakobKrieg <jakob.krieg@bcmsolutions.de>
diff --git a/docs/guides/onap-developer/how-to-use-docs/include-documentation.rst b/docs/guides/onap-developer/how-to-use-docs/include-documentation.rst
index c59e956..91f5309 100644
--- a/docs/guides/onap-developer/how-to-use-docs/include-documentation.rst
+++ b/docs/guides/onap-developer/how-to-use-docs/include-documentation.rst
@@ -475,6 +475,12 @@
    cd doc
    pip install -r etc/requirements.txt
 
+.. warning::
+
+	Just follow the next step (copying conf.py from Doc project to your project) 
+	if that is your intention, otherwise skip it. Currently all projects should already have a conf.py file. 
+	Through the next step, this file and potential extensions in your project get overriden.
+
 Copy the conf.py file to your project folder where RST files have been kept:
 
 .. code-block:: bash