doc: Add Osmux documentation to User Manual

Depends: osmo-gsm-manuals.git f3a734e6777a902abfb03257277454c7a879aeb7
Change-Id: I70c488c3d9b05599b834a8608e6361c8aa43ef31
diff --git a/doc/manuals/osmomsc-usermanual.adoc b/doc/manuals/osmomsc-usermanual.adoc
index 3c69d7b..d680a51 100644
--- a/doc/manuals/osmomsc-usermanual.adoc
+++ b/doc/manuals/osmomsc-usermanual.adoc
@@ -28,6 +28,8 @@
 
 include::./common/chapters/mncc.adoc[]
 
+include::{srcdir}/chapters/osmux_msc.adoc[]
+
 include::./common/chapters/control_if.adoc[]
 
 include::./common/chapters/gsup.adoc[]
@@ -39,4 +41,3 @@
 include::./common/chapters/glossary.adoc[]
 
 include::./common/chapters/gfdl.adoc[]
-