Remove includes and parameter functions

We no longer are support parameter functions and includes for zuulv3.
However, we may reclaim includes in the future so we can support raw
inclusions, so everything does not have to be in one file.

Story: #2000784

Change-Id: I58608ae564a890bca19eef63d9ae73fa388adf39
Signed-off-by: Paul Belanger <pabelanger@redhat.com>
diff --git a/doc/source/launchers.rst b/doc/source/launchers.rst
index 78d5839..8a8c932 100644
--- a/doc/source/launchers.rst
+++ b/doc/source/launchers.rst
@@ -273,9 +273,7 @@
   build:FUNCTION_NAME:NODE_NAME
 
 where **NODE_NAME** is the name or class of node on which the job
-should be run.  This can be specified by setting the ZUUL_NODE
-parameter in a parameter-function (see :ref:`includes` section in
-:ref:`zuulconf`).
+should be run.
 
 Zuul sends the ZUUL_* parameters described in `Zuul Parameters`_
 encoded in JSON format as the argument included with the