Add "scout" and "scout all" to the docs (#1957)

I saw this issue #1417 and thought that is something I can help add to
the doc. Hope this is what was intended and let me know if I'm doing
something wrong.

## Checklist

- [ ] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [x] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [ ] I have not broken the cheatsheet

Author: PiIsFour

docs/user/README.md

@@ -679,6 +679,8 @@ Each of these commands performs a vscode action of the same or a similar name on
 - `"reference <TARGET>"` search the workspace for all references to the target
 - `"hover <TARGET>"` displays the tooltip that would appear if you hovered the mouse over the target
 - `"quick fix <TARGET>"` displays quick fixes and refactors suggested by the vscode
+- `"scout <TARGET>"` search the document for the target
+- `"scout all <TARGET>"` search the workspace for the target
 
 eg:
 `define blue air`