libpq options

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/9.6/static/libpq-connect.html
Description:

Hi everyone, 

The documentation refers the libpq connection option "replication" here in
"Streaming Replication Protocol" page;

https://www.postgresql.org/docs/current/static/protocol-replication.html

However the option "replication" is not clarified (or even listed) in libpq
options page.

https://www.postgresql.org/docs/current/static/libpq-connect.html#LIBPQ-PARAMKEYWORDS

I searched the source and find that pg_conn struct has this 

struct pg_conn
{
...
  char *replication; /* connect as the replication standby? */
...
}

Adding something simple like above and referring back to one of replication
pages would be good I think. 

thanks