`with_pages` documentation does not agree with implementation

[Adamiomn]

PdfDocument in lib.rs has a method with_pages that states

/// Replaces document.pages with the new pages

However, the implementation uses append

    pub fn with_pages(&mut self, pages: Vec<PdfPage>) -> &mut Self {
        let mut pages = pages;
        self.pages.append(&mut pages);
        self
    }

Not sure what the intended behaviour is, both appending and replacing may be useful.

[fschutt]

Yeah, it should append the pages, so that you can do PdfDocument::new("title").with_pages(pages).save(options);

I think the pages field is public, so then you could just replace it yourself.