Incorrect field descriptions in rcord service xproto

The two field descriptions are incorrect:

required manytoone upstream_bps->BandwidthProfile:us_subscriber = 31:1001 [
help_text = "The subscriber the IP address belongs to"];
required manytoone downstream_bps->BandwidthProfile:ds_subscriber = 32:1002 [
help_text = "The subscriber the IP address belongs to"];