Documentation uses nonfunctional "application_name" as an example connection parameter

[mweatherley]

In the documentation (e.g. of pog.connection_parameter), "application_name" is used as an example parameter, but this parameter is always overridden by pgo with the value of node() (e.g. nonode@nohost), so this doesn't actually work.

[lpil]

Oh how odd. Perhaps we could get PGO to support this parameter