fix(config-backup): ignore a Docker case's conversation id, list every ignored key, correct the retention and restart docs

docs/wiki/Settings-Reference.md

@@ -192,7 +192,7 @@ mode, the **Users** administration entry is injected here.
 
 The **Config backups** group controls timestamped copies of your configuration files: an
 on/off switch (on by default), the backup folder (default `~/.codeman/backups/config`), how
-many backups to keep (1 to 500, default 20) and how many days to keep them (0 to 3650, default
+many backups to keep (2 to 500, default 20) and how many days to keep them (0 to 3650, default
 30; 0 means no age limit), plus **Back up now** and a list with **Restore**. These are
 server-side settings, read fresh. Details, naming and restore behaviour are on
 [Config Backups](Config-Backups).