doc/manuals: Introduce chapter explaining config data mangling

Explains how configurations bits are arranged and mangled to provide a
last config set.

Change-Id: I5c8f136e743b6beb02956b3436aa3d1010205141
diff --git a/doc/manuals/chapters/resource_pool.adoc b/doc/manuals/chapters/resource_pool.adoc
index 4a56767..072f42d 100644
--- a/doc/manuals/chapters/resource_pool.adoc
+++ b/doc/manuals/chapters/resource_pool.adoc
@@ -105,3 +105,7 @@
 If required resources are unavailable, the test trial fails. For consecutive
 test trials, a test run needs to either wait for resources to become available,
 or test suites need to be scheduled to make sense. (*<- TODO*)
+
+=== Understanding config parsing process
+
+include::{srcdir}/chapters/config_mangling.adoc[]