docs(poetry-add-help): resolve discrepancy between cli help and webpa…

[tjzegmott]

Pull Request Check List

Resolves: #6887

• Added tests for changed code.
• Updated documentation for changed code.

Small changes to poetry add's docstring to fix discrepancy with the webpage.

[neersighted]

I actually think we should drop the SSH lines entirely -- a "Git URL" encompasses multiple protocols, such as HTTPS, HTTP (see #6619), Git (the wire-protocol), and SSH. We could add a list of accepted protocols as Poetry does not (currently) accept HTTP, and we do not intend to support git+file:// or git+git:// if you think being explicit is better; however, the latter are so rarely used that I think the error message might be sufficient.

[neersighted]

As per my PR comment.

[github-actions]

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