update Dynamic-Forms document

docs/en/UI/AspNetCore/Tag-Helpers/Dynamic-Forms.md

@@ -108,6 +108,10 @@ See the [dynamic forms demo page](https://bootstrap-taghelpers.abp.io/Components
 
 Sets the c# model for dynamic form. Properties of this modal are turned into inputs in the form.
 
+### abp-column
+
+Set up columns in a dynamic form. The value is between 1~6 .
+
 ### submit-button
 
 Can be `True` or `False`. 

docs/zh-Hans/UI/AspNetCore/Tag-Helpers/Dynamic-Forms.md

@@ -110,6 +110,10 @@ public class DynamicFormsModel : PageModel
 
 为动态表单设置c#模型,模型的属性以表单形式转化为输入.
 
+### abp-column
+
+设置动态表单控件展示列数，值范围：1~6.
+
 ### submit-button
 
 可以为 `True` 或 `False`.