!149 优化代码格式

Merge pull request !149 from AprilWind/feat/dev-docs

ruoyi-auth/src/main/java/org/dromara/auth/controller/CaptchaController.java

@@ -64,6 +64,7 @@ public class CaptchaController {
         AbstractCaptcha captcha = SpringUtils.getBean(captchaProperties.getCategory().getClazz());
         captcha.setGenerator(codeGenerator);
         captcha.createCode();
+        // 如果是数学验证码，使用SpEL表达式处理验证码结果
         String code = captcha.getCode();
         if (isMath) {
             ExpressionParser parser = new SpelExpressionParser();