change enum in NXdetector

# Conflicts:
#	base_classes/nyaml/NXdetector.yaml

base_classes/NXdetector.nxdl.xml

@@ -587,7 +587,7 @@
             <item value="event"/>
             <item value="histogrammed"/>
             <item value="decimated"/>
-            <item value="pulse_counting"/>
+            <item value="pulse counting"/>
         </enumeration>
     </field>
     <field name="angular_calibration_applied" type="NX_BOOLEAN">