configuration: drop note about lackin E1 support

We have now support for E1 trunks

Change-Id: If62f2b646c3b649fa3cbb5ea7007e17b80086bce
diff --git a/doc/manuals/chapters/configuration.adoc b/doc/manuals/chapters/configuration.adoc
index 5e79e49..8b8e3bf 100644
--- a/doc/manuals/chapters/configuration.adoc
+++ b/doc/manuals/chapters/configuration.adoc
@@ -28,9 +28,8 @@
 in the config-mgcp context.
 
 All other trunks are configured in the config-mgcp-trunk context, but the
-commands used are identical. Right now trunks are considered only for ds/e1
-type endpoints which are not yet implemented. Don't use trunks other than the
-"virtual" trunk 0.
+commands used are identical. Right now trunks are considered only for "ds/e1"
+type endpoints.
 
 .Example: MGCP trunk configuration
 ----