docs: remove unused automatic_review configuration option

Author: mrT23

pr_agent/settings/configuration.toml

@@ -55,10 +55,9 @@ require_can_be_split_review=false
 require_security_review=true
 require_ticket_analysis_review=true
 # general options
-num_code_suggestions=0
+num_code_suggestions=0 # legacy mode. use the `improve` command instead
 inline_code_comments = false
 ask_and_reflect=false
-#automatic_review=true
 persistent_comment=true
 extra_instructions = ""
 final_update_message = true