Correct the information about the return value when no device matches (or no information is available).
Correct the information about the return value when no device matches
(or no information is available).

PR:             docs/12707
Submitted by:   Chris Costello <chris@calldei.com>

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