[python-package] [docs]: weights params description should read weights should be non-negative

[TremaMiguel]

Description

Following conversation on PR #4894, any method using weight parameter should describe the following

Weight should be non-negative values because the Hessian value multiplied by weight is supposed to be non-negative.

[jameslamb]

Thanks for writing this up @TremaMiguel . In the future, when referencing a particular comment thread please provide a link directly to it: #4894 (comment). There are many resolved conversations on #4894 and it might be difficult to figure out which conversation on that PR this issue's description refers to.

Are you interested in opening a pull request with this addition to the documentation?

[StrikerRUS]

@jameslamb

Are you interested in opening a pull request with this addition to the documentation?

I believe answer is

yes, once this PR is done.
#4894 (comment)

[akshitadixit]

Hi is this issue available to work on?

[jameslamb]

thanks for the interest @akshitadixit ! But based on the comment above, I think @TremaMiguel wanted to do this.

[akshitadixit]

Okay no worries

[TremaMiguel]

Ok @jameslamb I'll start working on this. Thanks for the reminder.

[github-actions]

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