docs: add all-episodes example to help menu

[veloxiromus]

Pull Request Template

Type of change

• Bug fix
• Feature
• Documentation update

Description

References #1950.

Documented the existing "-e/-r "1 -1"" syntax in the help menu and added an example showing how to select all episodes.

Checklist

• any anime playing
• bumped version

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• next, prev, replay and select work
• "-c" history and continue work
• "-d" downloads work
• "-e" (select episode) aka "-r" (range selection) works
• "-S" select index works
• "-q" quality works
• "-s" syncplay works
• "-v" vlc works
• "--dub" and regular (sub) mode both work
• "--nextep-countdown" countdown to next ep works

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• "-h" help info is up to date
• Readme is up to date
• Man page is up to date