ax(mining): replace prose comment with usage example on addCliArgs

AX principle 2: comments show HOW with real values, not WHAT the signature already says.

Co-Authored-By: Charon <charon@lethean.io>

pkg/mining/xmrig_start.go

@@ -166,7 +166,8 @@ func (m *XMRigMiner) Stop() error {
 	return nil
 }
 
-// addCliArgs is a helper to append command line arguments based on the config.
+// args := []string{"--log-file", logPath}
+// addCliArgs(&Config{Pool: "pool.lthn.io:3333", Wallet: "addr", Threads: 4, TLS: true}, &args)
 func addCliArgs(config *Config, args *[]string) {
 	if config.Pool != "" {
 		*args = append(*args, "-o", config.Pool)