Docs: update popover.md (#22083)

Author: lm312

examples/docs/en-US/popover.md

@@ -149,7 +149,7 @@ Of course, you can nest other operations. It's more light-weight than using a di
 |  offset        |  popover offset  | number           | — |  0 |
 |  transition     |  popover transition animation      | string             | — | el-fade-in-linear |
 |  visible-arrow   |  whether a tooltip arrow is displayed or not. For more info, please refer to [Vue-popper](https://github.com/element-component/vue-popper) | boolean | — | true |
-|  popper-options        | parameters for [popper.js](https://popper.js.org/documentation.html) | object            | please refer to [popper.js](https://popper.js.org/documentation.html) | `{ boundariesElement: 'body', gpuAcceleration: false }` |
+|  popper-options        | parameters for [popper.js](https://popper.js.org/docs/v2/) | object            | please refer to [popper.js](https://popper.js.org/docs/v2/) | `{ boundariesElement: 'body', gpuAcceleration: false }` |
 |  popper-class        |  custom class name for popover | string | — | — |
 |  open-delay        | delay before appearing when `trigger` is hover, in milliseconds | number | — | — |
 |  close-delay        | delay before disappearing when `trigger` is hover, in milliseconds | number | — | 200 |

examples/docs/es/popover.md

@@ -148,7 +148,7 @@ Por supuesto, puedes anidar otras operaciones. Es más ligero que utilizar un `d
 | offset         | popover offset                           | number         | —                                        | 0                                        |
 | transition     | animación de transición del popover | string         | —                                        | el-fade-in-linear                        |
 | visible-arrow  | si una flecha del tooltip es mostrada o no. Para más información, por favor refiérase a [Vue-popper](https://github.com/element-component/vue-popper) | boolean        | —                                        | true                                     |
-| popper-options | parámetros para [popper.js](https://popper.js.org/documentation.html) | object         | por favor, refiérase a [popper.js](https://popper.js.org/documentation.html) | `{ boundariesElement: 'body', gpuAcceleration: false }` |
+| popper-options | parámetros para [popper.js](https://popper.js.org/docs/v2/) | object         | por favor, refiérase a [popper.js](https://popper.js.org/docs/v2/) | `{ boundariesElement: 'body', gpuAcceleration: false }` |
 | popper-class   | clase propia para popover                | string         | —                                        | —                                        |
 | open-delay     | retraso de la aparición cuando `trigger` es hover, en mili segundos | number         | —                                        | —                                        |
 | close-delay    | Retraso antes de desaparecer cuando el `trigger` es hover, en mili segundos. | number | — | 200 |

examples/docs/fr-FR/popover.md

@@ -150,7 +150,7 @@ Vous pouvez aussi imbriquer des opérations. Procéder ainsi est plus léger que
 | offset | Décalage du popover. | number | — |  0 |
 | transition | Animation de transition du popover. | string | — | el-fade-in-linear |
 | visible-arrow | Si une flèche doit être affichée ou non. Pour plus d'informations, référez-vous à [Vue-popper](https://github.com/element-component/vue-popper). | boolean | — | true |
-| popper-options | Paramètres pour [popper.js](https://popper.js.org/documentation.html). | object | Référez-vous à [popper.js](https://popper.js.org/documentation.html). | `{ boundariesElement: 'body', gpuAcceleration: false }` |
+| popper-options | Paramètres pour [popper.js](https://popper.js.org/docs/v2/). | object | Référez-vous à [popper.js](https://popper.js.org/docs/v2/). | `{ boundariesElement: 'body', gpuAcceleration: false }` |
 | popper-class | Classe du popover. | string | — | — |
 | open-delay | Délai d'affichage, lorsque `trigger` est 'hover', en millisecondes. | number | — | — |
 | close-delay | delay before disappearing when `trigger` is hover, in milliseconds | number | — | 200 |

examples/docs/zh-CN/popover.md

@@ -146,7 +146,7 @@ Popover 的属性与 Tooltip 很类似，它们都是基于`Vue-popper`开发的
 |  offset        |  出现位置的偏移量  | Number           | — |  0 |
 |  transition     |  定义渐变动画      | String             | — | fade-in-linear |
 |  visible-arrow   |  是否显示 Tooltip 箭头，更多参数可见[Vue-popper](https://github.com/element-component/vue-popper) | Boolean | — | true |
-|  popper-options        | [popper.js](https://popper.js.org/) 的参数 | Object            | 参考 [popper.js](https://popper.js.org/) 文档 | `{ boundariesElement: 'body', gpuAcceleration: false }` |
+|  popper-options        | [popper.js](https://popper.js.org/docs/v2/) 的参数 | Object            | 参考 [popper.js](https://popper.js.org/docs/v2/) 文档 | `{ boundariesElement: 'body', gpuAcceleration: false }` |
 | popper-class | 为 popper 添加类名 | String | — | — |
 | open-delay | 触发方式为 hover 时的显示延迟，单位为毫秒 | Number | — | — |
 | close-delay | 触发方式为 hover 时的隐藏延迟，单位为毫秒 | number | — | 200 |