Fix small typos in lua_api.txt (#9546)

doc/lua_api.txt

@@ -4460,8 +4460,8 @@ Authentication
 * `minetest.auth_reload()`
     * See `reload()` in authentication handler definition
 
-`minetest.set_player_password`, `minetest_set_player_privs`,
-`minetest_get_player_privs` and `minetest.auth_reload` call the authentication
+`minetest.set_player_password`, `minetest.set_player_privs`,
+`minetest.get_player_privs` and `minetest.auth_reload` call the authentication
 handler.
 
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