Wrong add publishable repositories command in documentation

[hktkzyx]

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Issue

In the latest document, the add publishable repositories command in the section of Repositories/Publishable Repositories is wrong.
When I run the command as shown in the document,

poetry config repository.testpypi https://upload.test.pypi.org/legacy/

a ValueError: You cannot remove the [repositories] section is raised. Although my poetry version is 1.1.13, I check the latest code and found the same problem in the latest version. Thus, no repository key, need replace it by repositories.

Besides, the upload legacy API for Test PyPI is not https://upload.test.pypi.org/legacy/. It should be https://test.pypi.org/legacy/. Therefore, this command should be revised to

poetry config repositories.testpypi https://test.pypi.org/legacy/

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