Fix method name typo

[wazery]

I am not sure if this is a typo or it's written this way intentionally, but in case if it's a typo please merge.

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[seuros]

It a typo, as you can see in the doc
If any calls to +from_whitelisted_ip?+ and +acceptable_content_type?+

[gsamokovarov]

Definitely a typo. Thanks for catching it!