Remove unnecessary language

[AshKyd]

I'm trying to work out how to do something complex, and found this language alienating because being new to Apollo/Rest Link, there's nothing straightforward about it 😅

The paragraph works fine without it so I propose to remove it entirely.

Checklist:

• [✔] If this PR is a new feature, please reference an issue where a consensus about the design was reached (not necessary for small changes)
• [✔] Make sure all of the significant new logic is covered by tests

[apollo-cla]

@AshKyd: Thank you for submitting a pull request! Before we can merge it, you'll need to sign the Apollo Contributor License Agreement here: https://contribute.apollographql.com/

[benjamn]

Fair enough, thanks @AshKyd!