[2225_statistics] update counter class names in docstring

src/lib/python/isc/statistics/counter.py

@@ -20,36 +20,35 @@ using the module `counter.py`, firstly the init() method should be
 invoked in each module like b10-xfrin or b10-xfrout after importing
 this module.
 
-  import counter
-  counter.init(SPECFILE_LOCATION)
+  from isc.statistics import Counter
+  Counter.init(SPECFILE_LOCATION)
 
-The first argument of counter.init() is required, which is the
+The first argument of Counter.init() is required, which is the
 location of the specification file like src/bin/xfrout/xfrout.spec. If
 this initial preparation is done, statistics counters can be accessed
 from each module. For example, in case that the item `xfrreqdone` is
 defined in statistics_spec in xfrout.spec, the following methods can
-be dynamically created: counter.inc_xfrreqdone(),
-counter.get_xfrreqdone(). Since these methods requires the string of
+be dynamically created: Counter.inc_xfrreqdone(),
+Counter.get_xfrreqdone(). Since these methods requires the string of
 the zone name in the first argument, in the b10-xfrout,
 
-  counter.inc_xfrreqdone(zone_name)
+  Counter.inc_xfrreqdone(zone_name)
 
 then the xfrreqdone counter corresponding to zone_name was
 incremented. For getting the current number of this counter, we can do
 this,
 
-  number = counter.get_xfrreqdone(zone_name)
+  number = Counter.get_xfrreqdone(zone_name)
 
 then the current number was obtained and set in the above variable
 `number`. Such a getter method would be mainly used for unittesting.
-These dynamic accessor are defined in detail in the concrete class
-XfroutCounter. In other example, regarding the item `axfr_running`,
+In other example, regarding the item `axfr_running`,
 the decrementer method is also created:
-counter.dec_axfr_running(). This method is used for decrementing the
+Counter.dec_axfr_running(). This method is used for decrementing the
 counter number.  Regarding the item `axfr_running`, an argument like
 zone name is not required.
 
-  counter.dec_axfr_running()
+  Counter.dec_axfr_running()
 
 These accessors are effective in other module. For example, in case
 that this module `counter.py` is once imported in such a main module
@@ -57,7 +56,7 @@ as b10-xfrout, Regarding the item `notifyoutv4`, the incrementer
 inc_notifyoutv4() can be invoked via other module like notify_out.py,
 which is firstly imported in the main module.
 
-  counter.inc_notifyoutv4(zone_name)
+  Counter.inc_notifyoutv4(zone_name)
 
 In this example this is for incrementing the counter of the item
 notifyoutv4. Thus, such statement can be also written in the other
@@ -160,8 +159,7 @@ class Counter():
             setattr(Counter, k, v)
         return _COUNTER
 
-    # These method are dummies for notify_out in case XfroutCounter is not
-    # loaded.
+    # These method are dummies for isc.notify.notify_out.
     def inc_notifyoutv4(arg):
         """An empty method to be disclosed"""
         pass