changed .pdf part of api

[jshamg]

corrected example for future. old one doesn't work in our project anymore. thanks for this awesome tool btw!

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[mathiasbynens]

@jshamg Could you please sign the CLA at https://cla.developers.google.com/? Thanks.

[jshamg]

@googlebot I signed it!

[jshamg]

@jshamg Could you please sign the CLA at https://cla.developers.google.com/? Thanks.

sold my soul ✌️ :)