Documentation/parport.txt: convert to ReST markup

- Add a document title;
- use quote blocks where needed;
- convert parameters to a nested table;
- use monotonic fonts for config options and file names;
- adjust whitespaces and blank lines;
- replace _foo_ by **foo**;
- add it to the user's book.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

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