Put the SS7 PC name resolution feature in the release notes.

Fix the casing of the preference while at it (it now matches other name
resolution preferences).

Change-Id: Ibfecbc94f9eccefa7d3b1a50ae2598dfefb707a2
Reviewed-on: https://code.wireshark.org/review/18330
Reviewed-by: Anders Broman <a.broman58@gmail.com>

docbook/release-notes.asciidoc

@@ -33,6 +33,7 @@ since version 2.2.0:
   installing the Windows Installer package and vice-versa.
 * Source packages are now compressed using xz instead of bzip2.
 * GTK+ is disabled by default in Autotools and CMake.
+* SS7 Point Codes can now be resolved into names with a hosts-like file.
 
 //=== Removed Dissectors
 

epan/addr_resolv.c

@@ -2533,7 +2533,7 @@ addr_resolve_pref_init(module_t *nameres)
             &gbl_resolv_flags.vlan_name);
 
     prefs_register_bool_preference(nameres, "ss7_pc_name",
-        "Resolve SS7 PC",
+        "Resolve SS7 PCs",
         "Resolve SS7 Point Codes to describing names."
         " To do so you need a file called ss7pcs in your"
         " user preference directory. Format of the file is:"