Corrected list all recipients documentation Fixes #351

[Gimly]

Fixed the example query for list all recipients to be the same as the one in SendGrid's documentation. Removed the list_id parameter that was incorrect.

Fixes #351

[SendGridDX]

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[mbernier]

@Gimly did you find that the list_id param was not actually the issue, but the page size was the issue?

The original page size being 1 doesn't make sense, I just want to verify that I am following your change here.

[thinkingserious]

Hello @Gimly,

Thanks again for the PR!

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[Gimly]

@mbernier Yes, list_id didn't make sense in that call so I removed it, that fixed the issue. And since I was modifying the doc for that,I thought it would make sense that it was the same as the Sendgrid api. That's why I also modified the page_size.