Update PM Mapper documentation

Issue-ID: DCAEGEN2-1038
Change-Id: I9a8ca2c250553d955a81779e7119a9794ee4ff4c
Signed-off-by: dfarrelly <david.farrelly@est.tech>
diff --git a/docs/sections/services/pm-mapper/configuration.rst b/docs/sections/services/pm-mapper/configuration.rst
index d7a13aa..1e676c6 100644
--- a/docs/sections/services/pm-mapper/configuration.rst
+++ b/docs/sections/services/pm-mapper/configuration.rst
@@ -43,7 +43,7 @@
 
 ::
 
-        org.onap.dmaap.mr.PM_MAPPER
+        org.onap.dmaap.mr.PERFORMANCE_MEASUREMENTS
 
 Performance
 ^^^^^^^^^^^