Revert "linux: Fix saving file with root ownership (#22045)" (#23162)

Release Notes:

- (temporarily) Removes the linux "save file as root" feature while we
figure out bugs.

Updates https://github.com/zed-industries/zed/pull/22045

docs/src/linux.md

@@ -170,13 +170,3 @@ rm ~/.local/zed.app/lib/libcrypto.so.1.1
 ```
 
 This will force zed to fallback to the system `libssl` and `libcrypto` libraries.
-
-### Editing files requiring root access
-
-When you try to edit files that require root access, Zed requires `pkexec` (part of polkit) to handle authentication prompts.
-
-Polkit comes pre-installed with most desktop environments like GNOME and KDE. If you're using a minimal system and polkit is not installed, you can install it with:
-
-- Ubuntu/Debian: `sudo apt install policykit-1`
-- Fedora: `sudo dnf install polkit`
-- Arch Linux: `sudo pacman -S polkit`