Corrected types of page_info return value in documentation.
Corrected types of page_info return value in documentation.

Summary:
I was confused by the current documentation, as it was requesting me to pass the previously received `end_cursor` into the next fetch but it was declared as a boolean. I checked in the debugger and it's just mislabeled in the docs, so this PR fixes the docs.

I tried to push this change back in #15472 but wasn't able to undo the borked rebase, so I'm submitting a new PR.

This is a change to documentation only.

[DOCS] [BUGFIX] [Libraries/CameralRoll/CameraRoll.js] - Corrected return type in the documentation for the `start_cursor` and `end_cursor` values.
Closes https://github.com/facebook/react-native/pull/16830

Differential Revision: D6371585

Pulled By: hramos

fbshipit-source-id: 5038041e95a04ea4c2de8d2b535a8a4e019289f6

Bhullnatik/react-native,dikaiosune/react-native,javache/react-native,exponent/react-native,pandiaraj44/react-native,rickbeerendonk/react-native,javache/react-native,hammerandchisel/react-native,ptmt/react-native-macos,hoangpham95/react-native,exponentjs/react-native,jevakallio/react-native,javache/react-native,ptmt/react-native-macos,facebook/react-native,Bhullnatik/react-native,dikaiosune/react-native,myntra/react-native,hammerandchisel/react-native,myntra/react-native,javache/react-native,hammerandchisel/react-native,hoangpham95/react-native,rickbeerendonk/react-native,facebook/react-native,Bhullnatik/react-native,kesha-antonov/react-native,arthuralee/react-native,pandiaraj44/react-native,hoastoolshop/react-native,jevakallio/react-native,ptmt/react-native-macos,kesha-antonov/react-native,ptmt/react-native-macos,hammerandchisel/react-native,jevakallio/react-native,exponentjs/react-native,exponent/react-native,myntra/react-native,arthuralee/react-native,pandiaraj44/react-native,janicduplessis/react-native,exponent/react-native,jevakallio/react-native,Bhullnatik/react-native,facebook/react-native,rickbeerendonk/react-native,facebook/react-native,kesha-antonov/react-native,dikaiosune/react-native,pandiaraj44/react-native,myntra/react-native,dikaiosune/react-native,dikaiosune/react-native,arthuralee/react-native,kesha-antonov/react-native,hoangpham95/react-native,exponentjs/react-native,hoangpham95/react-native,kesha-antonov/react-native,pandiaraj44/react-native,exponentjs/react-native,hoangpham95/react-native,myntra/react-native,jevakallio/react-native,Bhullnatik/react-native,hoastoolshop/react-native,kesha-antonov/react-native,janicduplessis/react-native,ptmt/react-native-macos,hoangpham95/react-native,jevakallio/react-native,rickbeerendonk/react-native,exponent/react-native,hoangpham95/react-native,kesha-antonov/react-native,hoastoolshop/react-native,rickbeerendonk/react-native,rickbeerendonk/react-native,facebook/react-native,Bhullnatik/react-native,javache/react-native,ptmt/react-native-macos,kesha-antonov/react-native,hoastoolshop/react-native,janicduplessis/react-native,dikaiosune/react-native,janicduplessis/react-native,rickbeerendonk/react-native,myntra/react-native,javache/react-native,myntra/react-native,Bhullnatik/react-native,exponent/react-native,rickbeerendonk/react-native,exponent/react-native,dikaiosune/react-native,javache/react-native,facebook/react-native,janicduplessis/react-native,pandiaraj44/react-native,myntra/react-native,facebook/react-native,jevakallio/react-native,arthuralee/react-native,ptmt/react-native-macos,hammerandchisel/react-native,hoangpham95/react-native,exponent/react-native,exponentjs/react-native,kesha-antonov/react-native,jevakallio/react-native,facebook/react-native,pandiaraj44/react-native,arthuralee/react-native,hoastoolshop/react-native,janicduplessis/react-native,hoastoolshop/react-native,exponentjs/react-native,exponentjs/react-native,pandiaraj44/react-native,hammerandchisel/react-native,javache/react-native,janicduplessis/react-native,hoastoolshop/react-native,exponent/react-native,ptmt/react-native-macos,dikaiosune/react-native,hoastoolshop/react-native,javache/react-native,hammerandchisel/react-native,janicduplessis/react-native,Bhullnatik/react-native,exponentjs/react-native,jevakallio/react-native,hammerandchisel/react-native,myntra/react-native,rickbeerendonk/react-native,facebook/react-native