Move all broadcast-* scripts from the "discovery" category to

"broadcast" (new category).

scripts/broadcast-ms-sql-discover.nse

@@ -9,7 +9,7 @@ Discovers Microsoft SQL servers in the same broadcast domain.
 
 author = "Patrik Karlsson"
 license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
-categories = {"discovery"}
+categories = {"broadcast"}
 
 require 'mssql'
 require 'target'
@@ -53,4 +53,4 @@ action = function()
 		table.insert( results, result_part )
 	end
 	return stdnse.format_output( true, results )
-end
+end