Fix incorrect MRQA train+SQuAD URL
MEMBER
Thanks ! could you regenerate the dataset_infos.json file ?

```
datasets-cli test ./datasets/mrqa --save_infos --all_configs --ignore_verifications
```

also cc @VictorSanh 
2020-12-04T15:09:20Z
https://github.com/huggingface/datasets/pull/1117#issuecomment-738835994
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2020-12-04T15:09:20Z
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CONTRIBUTOR
Oooops, good catch @jimmycode 
2020-12-04T15:31:05Z
https://github.com/huggingface/datasets/pull/1117#issuecomment-738847944
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CONTRIBUTOR
> Thanks ! could you regenerate the dataset_infos.json file ?
> 
> ```
> datasets-cli test ./datasets/mrqa --save_infos --all_configs --ignore_verifications
> ```
> 
> also cc @VictorSanh

Updated the `dataset_infos.json` file.
2020-12-04T18:21:26Z
https://github.com/huggingface/datasets/pull/1117#issuecomment-738941348
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Fix issue #1115 
