MFC 202285: - Note that if_xname, if_dname, and if_dunit are usually initialized via   if_initname(). - Document if_drv_flags and replace references to IFF_(RUNNING|OACTIVE)   with references to IFF_DRV_(RUNNING|OACTIVE). - Complete truncated sentence in the description of if_transmit by copying   from the description in if_qflush. - Add missing line breaks for translators.
MFC 202285:
- Note that if_xname, if_dname, and if_dunit are usually initialized via
  if_initname().
- Document if_drv_flags and replace references to IFF_(RUNNING|OACTIVE)
  with references to IFF_DRV_(RUNNING|OACTIVE).
- Complete truncated sentence in the description of if_transmit by copying
  from the description in if_qflush.
- Add missing line breaks for translators.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase