Documentation - SSL Certificates Authentication: Additional user name map entry necessary

pg_auto_failover 1.6.3:

We followed the recipe in the documentation and noticed, that for SSL certificates on monitor and two Postgres nodes, an additional user name map entry (not mentioned in the documentation) is necessary.

With only the entries mentioned in the docs we get the following messages in the logs of the Postgres nodes:
```
LOG: no match in usermap "pgautofailover" for user "pgautofailover_monitor" authenticated as "postgres"
FATAL: certificate authentication failed for user "pgautofailover_monitor"
DETAIL: Connection matched pg_hba.conf line 110: "hostssl all "pgautofailover_monitor" /32 cert map=pgautofailover"
```

We were able to get rid of these messages by adding the line
```
pgautofailover postgres pgautofailover_monitor
```

to the user name map file `pg_ident.conf`.
This confusion could be avoided for future users of pg_auto_failover by adding the line to the documentation.
Or do we have misunderstood our situation and made things worse?