fix VTY help strings related to TRX
fix VTY help strings related to TRX

osmocom/osmo-bts,osmocom/osmo-bts,shimaore/osmo-bts,shimaore/osmo-bts,geosphere/osmo-bts,geosphere/osmo-bts,telenoobie/osmo-bts,shimaore/osmo-bts,telenoobie/osmo-bts,telenoobie/osmo-bts,osmocom/osmo-bts,geosphere/osmo-bts,shimaore/osmo-bts,geosphere/osmo-bts,telenoobie/osmo-bts