icE1usb doc: DAHDI driver no longer experimental

Change-Id: I0c65d7be98f514a5f106472389472a177d3c58c2
diff --git a/doc/manuals/chapters/host-software.adoc b/doc/manuals/chapters/host-software.adoc
index 1d23312..356c897 100644
--- a/doc/manuals/chapters/host-software.adoc
+++ b/doc/manuals/chapters/host-software.adoc
@@ -26,7 +26,7 @@
 DAHDI is supported by a wide range of open source PBX / softswitch software,
 including Asterisk, FreeSWITCH and yate.
 
-There is an experimental DAHDI driver for the icE1usb available from
+There is a DAHDI driver for the icE1usb available from
 the `laforge/icE1usb` branch of the https://github.com/osmocom/dahdi-linux
 git repository.