[Doc] Circle (#799)

docs/markdown/en-US/circle.md

@@ -67,3 +67,9 @@ export default {
 | text | Text | `String` | - | - |
 | stroke-width | Stroke width | `Number` | `40` | - |
 | clockwise | Is clockwise | `Boolean` | `true` | - |
+
+### Cell Slot
+
+| name | Description |
+|-----------|-----------|
+| - | custom text content |

docs/markdown/zh-CN/circle.md

@@ -68,3 +68,9 @@ export default {
 | text | 文字 | `String` | - | - |
 | stroke-width | 进度条宽度 | `Number` | `40` | - |
 | clockwise | 是否顺时针增加 | `Boolean` | `true` | - |
+
+### Circle Slot
+
+| 名称 | 说明 |
+|-----------|-----------|
+| - | 自定义文字内容 |