Add Windows path for extensions (#42645)

mg and Kirill Bulatov created

### Description

The `installing-extensions.md` guide was missing the directory path for
the Windows platform. It currently only lists the paths for macOS and
Linux. This PR adds the correct path for Windows users
(`%LOCALAPPDATA%\zed\extensions`).

Release Notes:

- N/A

---------

Co-authored-by: Kirill Bulatov <mail4score@gmail.com>

Change summary

docs/src/extensions/installing-extensions.md | 1 +
1 file changed, 1 insertion(+)

Detailed changes

docs/src/extensions/installing-extensions.md 🔗

@@ -8,6 +8,7 @@ Here you can view the extensions that you currently have installed or search and
 
 - On macOS, extensions are installed in `~/Library/Application Support/Zed/extensions`.
 - On Linux, they are installed in either `$XDG_DATA_HOME/zed/extensions` or `~/.local/share/zed/extensions`.
+- On Windows, the directory is `%LOCALAPPDATA%\Zed\extensions`.
 
 This directory contains two subdirectories: