Correct the parameters' status in `return` section
Correct the parameters' status in `return` section

`iter` is read only and should not go invalid because of the function call.
bjori/libbson,mongodb/libbson,bjori/libbson,ajdavis/libbson,mapr/libbson,ajdavis/libbson,paulmelnikow/libbson,rcsanchez97/libbson,alexeyvo/libbson,mapr/libbson,Convey-Compliance/libbson,Convey-Compliance/libbson,paulmelnikow/libbson,Convey-Compliance/libbson,mapr/libbson,rcsanchez97/libbson,alexeyvo/libbson,paulmelnikow/libbson,paulmelnikow/libbson,mongodb/libbson,bjori/libbson,mongodb/libbson,rcsanchez97/libbson,paulmelnikow/libbson,alexeyvo/libbson,ajdavis/libbson