chore: note --bpf-log in the sample config

config.sample.toml

@@ -8,7 +8,7 @@ ipv6_hairpin_rule_pref = 100
 ipv4_hairpin_table_id = 4787
 ipv6_hairpin_table_id = 4787
 
-# For ports not in specified ranges, einat would passthourgh NAT if the traffic
+# For ports not in specified ranges, einat would passthrough NAT if the traffic
 # is on interface's external address. You should exclude ports of services (
 # e.g. SSH, HTTP server) serving on NAT host's external address and expecting
 # inbound initiaed traffic from NAT port ranges specified here.
@@ -40,6 +40,7 @@ nat66 = false
 
 # Set max BPF log level, developer facing debugging option,
 # would increases eBPF verification time if enabled.
+# You also set `--bpf-log <level>` for CLI.
 # 0: disable, 1: error, 2: warn, 3: info, 4: debug, 5: trace
 # View logs with `cat /sys/kernel/debug/tracing/trace_pipe`
 bpf_log_level = 0