docs: add further description for dialog size and dimension variants

one/docs/components/dialog.md

@@ -4,6 +4,8 @@
 
 ### 尺寸与全屏
 
+可选的 `ui` 属性值：`s`/`m`/`narrow`/`medium`/`wide`/`auto`。
+
 [[ demo src="/demo/dialog/size.vue" ]]
 
 ### 模态与非模态

one/docs/demo/dialog/size.vue

@@ -64,3 +64,11 @@ export default {
   margin-right: 20px;
 }
 </style>
+
+<docs>
+`s`/`m` 用于指定内容的尺寸，会被继承到内部的组件上。而 `narrow`/`medium`/`wide`/`fullscreen`/`auto` 是对话框本身所占区域的大小，可以与 `s`/`m` 混合使用。
+</docs>
+
+<docs locale="en-US">
+`s`/`m` are used to specify size for internal content and will be inherited by components inside the dialog. While `narrow`/`medium`/`wide`/`fullscreen`/`auto` are used to specify the dimension of the dialog itself, thus can be used together with `s`/`m`.
+</docs>

one/docs/en-US/components/dialog.md

@@ -2,6 +2,12 @@
 
 ## Demos
 
+### Sizes and fullscreen
+
+Available size/dimension variants for the `ui` prop: `s`/`m`/`narrow`/`medium`/`wide`/`auto`.
+
+[[ demo src="/demo/dialog/size.vue" ]]
+
 ### Modal and non-modal
 
 [[ demo src="/demo/dialog/modal.vue" ]]