Added -N documentation in man pages

doc/mdb-export.txt

@@ -18,6 +18,7 @@ OPTIONS
   -D            Set the date format (see strftime(3) for details)
   -q            Use to wrap text-like fields. Default is ".
   -X            Use to escape quoted characters within a field.  Default is doubling.
+  -N namespace  Prefix identifiers with namespace.
 
 
 NOTES 

doc/mdb-schema.txt

@@ -11,6 +11,7 @@ DESCRIPTION
 
 OPTIONS
   -T <table>, --table <table>       Single table option.  Create schema for this table only. Default is to export all tables.
+  -N namespace  Prefix identifiers with namespace.
   --drop-table        Issue DROP TABLE statement.
   --no-drop-table     Don't issue DROP TABLE statement. This is the default.
   --not-null          Issue NOT NULL constraints. This is the default.