Fix typo in help: 'urb' => 'urp'

Introduced in commit a4066c77 ("Fix documented 'soffice
--accept' parameter syntax").

Change-Id: Iaa8e821abeb8bdbce36091c4d0264f658c677a76
Reviewed-on: https://gerrit.libreoffice.org/72905Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>
Tested-by: Michael Stahl <Michael.Stahl@cib.de>

desktop/source/app/cmdlinehelp.cxx

@@ -102,8 +102,8 @@ namespace desktop
         "                       of arbitrary commands.                                  \n"
         "                       The syntax of the {connect-string} is:                  \n"
         "                         connection-type,params;protocol-name,params           \n"
-        "                       e.g.  pipe,name={some name};urb                         \n"
-        "                         or  socket,host=localhost,port=54321;urb              \n"
+        "                       e.g.  pipe,name={some name};urp                         \n"
+        "                         or  socket,host=localhost,port=54321;urp              \n"
         "   --unaccept={connect-string}  Closes an acceptor that was created with       \n"
         "                       --accept. Use --unaccept=all to close all acceptors.    \n"
         "   --language={lang}   Uses specified language, if language is not selected    \n"