[SR-Users] mtree README missing params

[Juha Heinanen]

looks like 4.1 and master mtree README is missing these parameters:

	{"pv_dstid",       STR_PARAM, &dstid_param.s},
	{"pv_weight",      STR_PARAM, &weight_param.s},
	{"pv_count",       STR_PARAM, &count_param.s},

i didn'd find in the code any use for the last.

-- juha