Solving issue #11362. Creating nltk_data in the $HOME directory.

[javierganan99]

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Motivation

The motivation is to solve issue #11362. NLTK default download creates a weird folder in the project directory level named ~/nltk_data, when it seems the intention is to create this at the $HOME directory.

Modification

I solve this issue using os library to efectively substitute ~ by $HOME directory. I modify it in the code and also in the related documentation.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMPreTrain.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[CLAassistant]

All committers have signed the CLA.

[hhaAndroid]

@javierganan99 Please fix the lint

[javierganan99]

I think that the error in the unittest is not related with my PR