docs: Add clarifying note about Vim subword motion (#44535)

Clarify the docs regarding how operators are affected when subword
motion in Vim is activated.

Ref:
https://github.com/zed-industries/zed/issues/23344#issuecomment-3186025873.

Release Notes:

- N/A

---------

Co-authored-by: Kunall Banerjee <hey@kimchiii.space>

docs/src/vim.md

@@ -471,7 +471,7 @@ But you cannot use the same shortcuts to move between all the editor docks (the
 }
 ```
 
-Subword motion, which allows you to navigate and select individual words in camelCase or snake_case, is not enabled by default. To enable it, add these bindings to your keymap.
+Subword motion, which allows you to navigate and select individual words in `camelCase` or `snake_case`, is not enabled by default. To enable it, add these bindings to your keymap.
 
 ```json [settings]
 {
@@ -485,6 +485,9 @@ Subword motion, which allows you to navigate and select individual words in came
 }
 ```
 
+> Note: Operations like `dw` remain unaffected. If you would like operations to
+> also use subword motion, remove `vim_mode != operator` from the `context`.
+
 Vim mode comes with shortcuts to surround the selection in normal mode (`ys`), but it doesn't have a shortcut to add surrounds in visual mode. By default, `shift-s` substitutes the selection (erases the text and enters insert mode). To use `shift-s` to add surrounds in visual mode, you can add the following object to your keymap.
 
 ```json [settings]