db_text: fix db url in example config

src/modules/db_text/doc/db_text.cfg

@@ -41,7 +41,7 @@ loadmodule "modules/auth_db/auth_db.so"
 
 # use dbtext database for persistent storage
 modparam("usrloc", "db_mode", 2)
-modparam("usrloc|auth_db", "db_url", "db_text:///tmp/kamailiodb")
+modparam("usrloc|auth_db", "db_url", "text:///tmp/kamailiodb")
 
 # -- auth params --
 #