Clarify what happens when virtualenvs.create is false.

[artslob]

• I have searched the issues of this repo and believe that this is not a duplicate.

Issue

This issue is about docs on configuration option virtualenvs.create. Currently it says about what happens when option is true. I think, its better to state explicitly, that when option is false, then poetry will install dependencies to current python interpreter/virtualenv.

[github-actions]

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