docs: add the keybinding-display convention

I added a rule for how to present a keymap's bindings when asked to show them. The format is a bulleted list grouped by prefix level: a General header at the top that lists the sub-prefixes leading into each category, then one section per category. Every bullet carries the full chord, the bound command, and the which-key label, so the written view matches what which-key shows on screen.

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