Fixed documentation issues in timestamping elements

Signed-off-by: Georgios Katsikas <katsikas.gp@gmail.com>

elements/analysis/numberpacket.hh

@@ -13,7 +13,7 @@ NumberPacket()
 
 =s
 
-Set an increasing number inside the payload of each packets
+Set an increasing number inside the payload of each packet
 
 =item OFFSET
 

elements/analysis/recordtimestamp.cc

 /*
- * recordtimestamp.{cc,hh} -- Store a packet count inside packet payload
+ * recordtimestamp.{cc,hh} -- Store a timestamp for numbered packets
  * Cyril Soldani, Tom Barbette
  *
  * Copyright (c) 2015-2016 University of Liège

elements/analysis/timestampdiff.cc

 /*
- * timestampdiff.{cc,hh} -- Store a packet count inside packet payload
+ * timestampdiff.{cc,hh} -- Compute the difference between the recorded
+ * timestamp of a packet using RecordTimestamp and a fresh timestamp
  * Cyril Soldani, Tom Barbette
  *
  * Various latency percentiles by Georgios Katsikas

elements/analysis/timestampdiff.hh

@@ -16,8 +16,8 @@ TimestampDiff()
 =s timestamps
 
 Compute the difference between the recorded timestamp of a packet using
-RecordTimestamp and the number inside the packet payload potentially set
-using NumberPacket
+RecordTimestamp and a fresh timestamp. Computations are performed only for
+numbered packets, either by a NumberPacket element or an external entity.
 
 Arguments:
 

elements/userlevel/monitoringreportsocket.cc

 // -*- mode: c++; c-basic-offset: 2 -*-
 /*
- * monitoringreportsocket.{cc,hh} -- periodically reports timestampted
+ * monitoringreportsocket.{cc,hh} -- periodically reports timestamped
  * values of element handlers via a UDP or TCP socket.
  * Useful for element handlers that contain arithmetic values.
  * Can be used for monitoring purposes; e.g., to report the run-time

elements/userlevel/monitoringreportsocket.hh

@@ -42,6 +42,10 @@ Keyword arguments are:
 Unsigned Integer. The frequency in seconds to schedule this element,
 thus send data to the remote server.
 
+=item CORE_NB
+
+Unsigned Integer. CPU core ID to schedule this element.
+
 =item SNDBUF
 
 Unsigned integer. Sets the maximum size in bytes of the underlying