improved the developer documentation

* tvb_*_length mentioned in README.dissector
* fixed typos in README.dissector
* using stats_tree_register_plugin in the stats_tree examples both in README.stats_tree and the dev guide
* removed the version information and the #endif from the stats tree section in README.dissector

Change-Id: I27df0b5dfd66a7c0ac5b0fe1bdc882b3e9ffda74
Reviewed-on: https://code.wireshark.org/review/12908
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com>
Reviewed-by: Michael Mann <mmann78@netscape.net>

AUTHORS

@@ -3669,6 +3669,10 @@ Guillaume Autran	<gautran[AT]clearpathrobotics.com> {
 	TCPROS support
 }
 
+Barbu Paul - Gheorghe	<barbu.paul.gheorghe[AT]gmail.com> {
+	Developer documentation improvements
+}
+
 
 and by:
 

doc/README.dissector

@@ -41,6 +41,7 @@ Laurent Deniel <laurent.deniel[AT]free.fr>
 Gerald Combs <gerald[AT]wireshark.org>
 Guy Harris <guy[AT]alum.mit.edu>
 Ulf Lamping <ulf.lamping[AT]web.de>
+Barbu Paul - Gheorghe <barbu.paul.gheorghe[AT]gmail.com>
 
 1. Setting up your protocol dissector code.
 
@@ -405,6 +406,16 @@ Pointer-retrieval:
  */
 guint8* tvb_get_ptr(tvbuff_t *tvb, gint offset, gint length);
 
+Length query:
+Get amount of captured data in the buffer (which is *NOT* necessarily the
+length of the packet). You probably want tvb_reported_length instead:
+
+    guint tvb_captured_length(const tvbuff_t *tvb);
+
+Get reported length of buffer:
+
+    guint tvb_reported_length(const tvbuff_t *tvb);
+
 
 1.4 Functions to handle columns in the traffic summary window.
 
@@ -2695,7 +2706,7 @@ upon the conversation index and values inside the request packets.
 NOTE:   This sections assumes that all information is available to
     create a complete conversation, source port/address and
     destination port/address.  If either the destination port or
-    address is know, see section 2.4 Dynamic server port dissector
+    address is known, see section 2.4 Dynamic server port dissector
     registration.
 
 For protocols that negotiate a secondary port connection, for example

doc/README.stats_tree

@@ -111,7 +111,7 @@ WS_DLL_PUBLIC_DEF const gchar version[] = "0.0";
 
 WS_DLL_PUBLIC_DEF void plugin_register_tap_listener(void) {
 
-    stats_tree_register("udp", /* the proto we are going to "tap" */
+    stats_tree_register_plugin("udp", /* the proto we are going to "tap" */
                                "udp_terms", /* the abbreviation for this tree (to be used as -z udp_terms,tree) */
                                st_str_udp_term, /* the name of the menu and window (use "/" for sub menus)*/
                                0, /* tap listener flags for per-packet callback */
@@ -132,6 +132,9 @@ the stats_tree API
 stats_tree_register( tapname, abbr, name, flags, packet_cb, init_cb, cleanup_cb);
  registers a new stats tree
 
+stats_tree_register_plugin(tapname, abbr, name, flags, packet_cb, init_cb, cleanup_cb);
+ registers a new stats tree from a plugin
+
 stats_tree_parent_id_by_name( st, parent_name)
   returns the id of a candidate parent node given its name
 

docbook/wsdg_src/WSDG_chapter_dissection.asciidoc

@@ -1060,18 +1060,14 @@ Here is a mechanism to produce statistics from the above TAP interface.
 ----
 /* register all http trees */
 static void register_foo_stat_trees(void) {
-    stats_tree_register("foo", "foo", "Foo/Packet Types",
+    stats_tree_register_plugin("foo", "foo", "Foo/Packet Types", 0,
         foo_stats_tree_packet, foo_stats_tree_init, NULL);
 }
 
-WS_DLL_PUBLIC_DEF const gchar version[] = "0.0";
-
 WS_DLL_PUBLIC_DEF void plugin_register_tap_listener(void)
 {
     register_foo_stat_trees();
 }
-
-#endif
 ----
 ====
 
@@ -1079,8 +1075,8 @@ Working from the bottom up, first the plugin interface entry point is defined,
 +plugin_register_tap_listener()+. This simply calls the initialisation function
 +register_foo_stat_trees()+.
 
-This in turn calls the +stats_tree_register()+ function, which takes three
+This in turn calls the +stats_tree_register_plugin()+ function, which takes three
-strings, and three functions.
+strings, an integer, and three callback functions.
 
 . This is the tap name that is registered.
 
@@ -1088,6 +1084,8 @@ strings, and three functions.
 
 . The name of the stats module. A $$'/'$$ character can be used to make sub menus.
 
+. Flags for per-packet callback
+
 . The function that will called to generate the stats.
 
 . A function that can be called to initialise the stats data.