pdfbook2: add page (#17567)

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>
Co-authored-by: Dylan <145150333+dmmqz@users.noreply.github.com>

pages/linux/pdfbook2.md

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+# pdfbook2
+
+> Create a double sided printable PDF booklet from a PDF.
+> Note: The booklet needs to be printed double-sided in landscape mode, flipped on the long edge.
+> More information: <https://github.com/jenom/pdfbook2#examples>.
+
+- Create a booklet named `file-book.pdf` with sane defaults:
+
+`pdfbook2 {{path/to/file.pdf}}`
+
+- Create a booklet with the paper size set to A4:
+
+`pdfbook2 {{[-p|--paper]}} a4paper {{path/to/file.pdf}}`
+
+- Create a booklet that has the inner margin reduced to 50 pixels (default = 150px):
+
+`pdfbook2 {{[-p|--paper]}} a4paper {{[-i|--inner-margin]}} 50 {{path/to/file.pdf}}`
+
+- Organize a large file with print signatures for binding into a larger booklet (signatures must be divisible by 4):
+
+`pdfbook2 {{[-p|--paper]}} a4paper --signature {{24}} {{path/to/file.pdf}}`