docs: Update ep docs for new bindings (#52326)

## Context

Split out from https://github.com/zed-industries/zed/pull/52258, because
#50136 isn't ready yet :(
Need to add descriptions of how to do each example binding in the Keymap
UI

## How to Review

- Ensure wording/structure is good
- Ensure no missing examples

## Self-Review Checklist

<!-- Check before requesting review: -->
- [ ] I've reviewed my own diff for quality, security, and reliability
- [ ] Unsafe blocks (if any) have justifying comments
- [ ] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [ ] Tests cover the new/changed behavior
- [ ] Performance impact has been considered and is acceptable

Release Notes:

- N/A or Added/Fixed/Improved ...

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Co-authored-by: Max <max@zed.dev>
Co-authored-by: Katie Geer <katie@zed.dev>
72540bb6dcBen Kunkle committed on 3/25/2026, 4:05:26 PM· committed by GitHubparente63bd1a
1 file changedLine totals unavailable