Update cats_vs_dogs size
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The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_3878). All of your documentation changes will be reflected on that endpoint. Maybe `NonMatchingSplitsSizesError` errors should also tell the user to try using a more recent version of the dataset to get the fixes ? @lhoestq Good idea. Will open a new PR to improve the error messages of NonMatchingSplitsSizesError, NonMatchingChecksumsError, ... It seems there is still a problem. I am using datasets version 2.5.1. 
I just typed `ds = load_dataset("cats_vs_dogs")` and get the error below.

```
NonMatchingSplitsSizesError: [{'expected': SplitInfo(name='train', num_bytes=3893603, num_examples=23422, dataset_name='cats_vs_dogs'), 'recorded': SplitInfo(name='train', num_bytes=3891612, num_examples=23410, dataset_name='cats_vs_dogs')}]
```
It looks like the dataset still only has 23,410 examples....
 Thanks for reporting, I opened https://github.com/huggingface/datasets/pull/5047
It seems like 12 new examples have been added to the `cats_vs_dogs`. This PR updates the size in the card and the info file to avoid a verification error (reported by @stevhliu). 
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