fix link (#1240)

docs/en/tasks/2d_animal_keypoint.md

@@ -35,7 +35,7 @@ MMPose supported datasets:
 
 For [Animal-Pose](https://sites.google.com/view/animal-pose/) dataset, we prepare the dataset as follows:
 
-1. Download the images of [PASCAL2011](http://www.google.com/url?q=http%3A%2F%2Fhost.robots.ox.ac.uk%2Fpascal%2FVOC%2Fvoc2011%2Findex.html&sa=D&sntz=1&usg=AFQjCNGmiJGkhSSWtShDe7NwRPyyyBUYSQ), especially the five categories (dog, cat, sheep, cow, horse), which we use as trainval dataset.
+1. Download the images of [PASCAL VOC2012](http://host.robots.ox.ac.uk/pascal/VOC/voc2012/#data), especially the five categories (dog, cat, sheep, cow, horse), which we use as trainval dataset.
 1. Download the [test-set](https://drive.google.com/drive/folders/1DwhQobZlGntOXxdm7vQsE4bqbFmN3b9y?usp=sharing) images with raw annotations (1000 images, 5 categories).
 1. We have pre-processed the annotations to make it compatible with MMPose. Please download the annotation files from [annotations](https://download.openmmlab.com/mmpose/datasets/animalpose_annotations.tar). If you would like to generate the annotations by yourself, please check our dataset parsing [codes](/tools/dataset/parse_animalpose_dataset.py).
 
@@ -51,7 +51,7 @@ mmpose
 `── data
     │── animalpose
         │
-        │-- VOC2011
+        │-- VOC2012
         │   │-- Annotations
         │   │-- ImageSets
         │   │-- JPEGImages