Documentation for 3GPP PM Mapper

Change-Id: Ifbc4928630a329eed019c1c79f129234dfa1fdd3
Issue-ID: DCAEGEN2-567
Signed-off-by: Rajendra Jaiswal <rajendra.jaiswal@ericsson.com>
diff --git a/docs/sections/services/serviceindex.rst b/docs/sections/services/serviceindex.rst
index 9589a6a..7c87f5c 100644
--- a/docs/sections/services/serviceindex.rst
+++ b/docs/sections/services/serviceindex.rst
@@ -17,3 +17,4 @@
    ./prh/index.rst
    ./dfc/index.rst
    ./heartbeat-ms/index.rst
+   ./pm-mapper/index.rst
\ No newline at end of file