Incorrect Git Clone URL in natural-language-processing-with-disaster-tweets-kaggle-competition

This command occurs in two spots in the README

`$ git clone https://github.com/kubeflow/examples/natural-language-processing-with-disaster-tweets-kaggle-competition
`
It should be:

`$ git clone https://github.com/kubeflow/examples/
`
Otherwise you'll get this error:

```
jovyan@tweets-0:~$ git clone https://github.com/kubeflow/examples/natural-language-processing-with-disaster-tweets-kaggle-competition
Cloning into 'natural-language-processing-with-disaster-tweets-kaggle-competition'...
remote: Not Found
fatal: repository 'https://github.com/kubeflow/examples/natural-language-processing-with-disaster-tweets-kaggle-competition/' not found
```

Search the README for the two occurrences of the incorrect git clone command shown in the issue. Update both commands to use the repository URL, then verify that the README no longer points to the nonexistent nested repository.

Written by the indexing model from the issue text.