Cosmetic: bsc_vty: tweak msc pooling strings

Drop "to this MSC" from the NRI_STR, as it is not only used for MSC
specific configuration, but also in cfg_net_nri_* which affect all MSCs.

Drop "for this MSC" from the description of cfg_net_nri_null_del, it
affects all MSCs (unlike cfg_msc_nri_del).

Change-Id: Ic8888775a965b6d607af51b9359bd8ffc2834e16
2 files changed