SDCORE-669 Added AMF documentation

Change-Id: Ic98a9da77872cc08d3d2a9b9e0ab10eba968db1b
diff --git a/dict.txt b/dict.txt
index 4ae7726..526e2d8 100644
--- a/dict.txt
+++ b/dict.txt
@@ -77,3 +77,4 @@
 Deregister
 ransim
 Ue
+Reachability