qpdf: Rewrite the whole file as per review comments

pages/common/qpdf.md

@@ -2,21 +2,21 @@
 
 > Versatile PDF transformation software.
 
-- Extract a few pages from a pdf into another one:
+- Extract pages 1-3, 5 and 6-10 from a PDF file and save them as another one:
 
-`qpdf --empty --pages {{input.pdf}} 1,6-8,12 -- {{output.pdf}}`
+`qpdf --empty --pages {{input.pdf}} {{1-3,5,6-10}} -- {{output.pdf}}`
 
-- Extract pages from multiple pdf files into one:
+- Merge (concatenate) a list of PDF files and save the result as another one:
 
-`qpdf --empty --pages {{file 1.pdf}} 1,6-8 --pages {{file 2.pdf}} 3,4,5 -- {{output.pdf}}`
+`qpdf --empty --pages {{file 1.pdf}} {{1,6-8}} --pages {{file 2.pdf}} {{3,4,5}} -- {{output.pdf}}`
 
-- Write each group of n pages to a separate output file:
+- Write each group of n pages to a separate output file with a given filename pattern:
 
-`qpdf --split-pages=n {{input.pdf}} {{page %d.pdf}}`
+`qpdf --split-pages=n {{input.pdf}} {{out_%d.pdf}}`
 
 - Rotate and transform the PDF:
 
-`qpdf --rotate=+90:2,4,6 --rotate=180:7-8 {{input.pdf}} {{output.pdf}}`
+`qpdf --rotate={{90:2,4,6}} --rotate={{180:7-8}} {{input.pdf}} {{output.pdf}}`
 
 - Remove the password from a password protected file: