DOC: Correct log levels

config/fail2ban.conf

@@ -6,7 +6,7 @@
 #           file, but provide customizations in fail2ban.local file, e.g.:
 #
 # [Definition]
-# loglevel = 4
+# loglevel = DEBUG
 #
 
 [Definition]

man/jail.conf.5

@@ -107,7 +107,7 @@ These files have one section, [Definition].
 The items that can be set are:
 .TP
 .B loglevel
-verbosity level of log output: 1 = ERROR, 2 = WARN, 3 = INFO, 4 = DEBUG. Default: 1
+verbosity level of log output: CRITICAL, ERROR, WARNING, NOTICE, INFO, DEBUG. Default: ERROR
 .TP
 .B logtarget
 log target: filename, SYSLOG, STDERR or STDOUT. Default: STDERR . Only a single log target can be specified.