update 调整缩进，补充注释

gssong

2024-06-02 2e32b748b6cf5bcc3004b354f56ce007420fb1d9

 ruoyi-common/ruoyi-common-mybatis/src/main/java/org/dromara/common/mybatis/core/page/PageQuery.java

@@ -111,4 +111,8 @@
        return list;
    }

    public Integer getFirstNum() {
        return (pageNum - 1) * pageSize;
    }

}