[docs] [issue13605] document argparse's nargs=REMAINDER

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

I have added the missing “::” before code blocks (one was added by the patch you committed, others were already here).

I’m not entirely sure they are needed (Python code blocks seem to be autodetected and show up colorized too), but I did it for consistency (and to make my editor detect them).

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