docs: add vi mode shortcuts and clarify MCP/custom sandbox setup (#23853)

Co-authored-by: Sam Roberts <158088236+g-samroberts@users.noreply.github.com>

docs/reference/keyboard-shortcuts.md

@@ -326,6 +326,29 @@ lines and `3w` moves forward three words.
 Counts are also supported for editing commands. For example, `3dd` deletes three
 lines and `2cw` changes two words.
 
+### Find, replace, yank, and paste in NORMAL mode
+
+| Action                                    | Keys        |
+| ----------------------------------------- | ----------- |
+| Find next matching character              | `f{char}`   |
+| Find previous matching character          | `F{char}`   |
+| Move until before next matching character | `t{char}`   |
+| Move until after previous matching char   | `T{char}`   |
+| Repeat latest character find              | `;`         |
+| Repeat latest character find in reverse   | `,`         |
+| Delete character before cursor            | `X`         |
+| Toggle case under cursor                  | `~`         |
+| Replace character under cursor            | `r{char}`   |
+| Yank line                                 | `yy`        |
+| Yank to end of line                       | `Y` or `y$` |
+| Yank word / WORD                          | `yw`, `yW`  |
+| Yank to end of word / WORD                | `ye`, `yE`  |
+| Paste after cursor                        | `p`         |
+| Paste before cursor                       | `P`         |
+
+Delete and change operators also compose with character-find motions, so
+commands such as `dfx`, `dtx`, `cFx`, and `cTx` are supported.
+
 ## Limitations
 
 - On [Windows Terminal](https://en.wikipedia.org/wiki/Windows_Terminal):