This is what I have in postgres 10 pg_settings table: and the documentation has different description. What's more the default value is outside the range of the min/max value.
-[ RECORD 2 ]---+------------------------------------------------------------------------------------------ name | autovacuum_analyze_scale_factor setting | 0.1 unit | [NULL] category | Autovacuum short_desc | Number of tuple inserts, updates, or deletes prior to analyze as a fraction of reltuples. extra_desc | [NULL] context | sighup vartype | real source | default min_val | 0 max_val | 100 enumvals | [NULL] boot_val | 0.1 reset_val | 0.1 sourcefile | [NULL] sourceline | [NULL] pending_restart | f
