pdftoppm: add page (#7764)

pages/linux/pdftoppm.md

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+# pdftoppm
+
+> Convert PDF document pages to portable Pixmap (image formats).
+> More information: <https://manned.org/pdftoppm>.
+
+- Specify the range of pages to convert (N-first page, M-last page):
+
+`pdftoppm -f {{N}} -l {{M}} {{path/to/file.pdf}} {{image_name_prefix}}`
+
+- Convert only the first page of a PDF:
+
+`pdftoppm -singlefile {{path/to/file.pdf}} {{image_name_prefix}}`
+
+- Generate a monochrome PBM file (instead of a color PPM file):
+
+`pdftoppm -mono {{path/to/file.pdf}} {{image_name_prefix}}`
+
+- Generate a grayscale PGM file (instead of a color PPM file):
+
+`pdftoppm -gray {{path/to/file.pdf}} {{image_name_prefix}}`
+
+- Generate a PNG file instead a PPM file:
+
+`pdftoppm -png {{path/to/file.pdf}} {{image_name_prefix}}`