tip for counters fullnames

doc/docs/config_mca.md

@@ -114,6 +114,12 @@ DEMO [13]: fx8.counters
            .NoiSe
 ```
 
+To add a roi counter in a measurement group, the *fullname* must be used.
+
+!!!tip
+    `lscnt()` command can be used to easily retrieve the full name of a roi counter.
+
+
 
 ### ROI in config
 

doc/docs/config_mg.md

@@ -68,7 +68,7 @@ Example:
   name: MG_sim
   counters:
   - sim_ct_1
-  - simulation_counter_controller:sim_ct_2   <------ full name
+  - simulation_counter_controller:sim_ct_2   <------ full name with colon
 ```