Operator `at` not documented

[gergelyk]

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

Issue

Docs are not too verbose on what @ operator means. E.g. three commands bellow seem to do the same thing:

poetry add 'bar@1.2.3'
poetry add 'bar=1.2.3'
poetry add 'bar==1.2.3'

Additionally these few are accepted as well:

poetry add 'bar@=1.2.3'
poetry add 'bar@==1.2.3'
poetry add 'bar===1.2.3'
poetry add 'bar====1.2.3'

[github-actions]

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