docs(cmd): clarify repeated trend stats validation comment

Related to #1143 (comment)

cmd/config.go

@@ -311,11 +311,10 @@ func getConsolidatedConfig(fs afero.Fs, cliConf Config, runner lib.Runner) (conf
 	conf = applyDefault(conf)
 
 	// TODO(imiric): Move this validation where it makes sense in the configuration
-	// refactor of #883. Currently we validate CLI flags in cmd.getOptions. Yet
-	// there is no place where configuration is validated after applying all other
-	// sources, like environment variables (besides inline in the runCmd itself...).
-	// So this repeats the trend stats validation in case other sources overrode our
-	// default value.
+	// refactor of #883. This repeats the trend stats validation already done
+	// for CLI flags in cmd.getOptions, in case other configuration sources
+	// (e.g. env vars) overrode our default value. This is not done in
+	// lib.Options.Validate to avoid circular imports.
 	if err = ui.ValidateSummary(conf.SummaryTrendStats); err != nil {
 		return conf, err
 	}