Update keymap.md

Align with changes from sxyazi/yazi#2609

Author: Nicholas42

docs/configuration/keymap.md

@@ -142,6 +142,7 @@ Exit the process.
 
 | Argument/Option | Description                                                                    |
 | --------------- | ------------------------------------------------------------------------------ |
+| `--code [n]`    | Return with exit code `n` (indicating an error)                                |
 | `--no-cwd-file` | Don't output the current directory to the file specified by `yazi --cwd-file`. |
 
 ### `close` {#manager.close}
@@ -150,6 +151,7 @@ Close the current tab; if it's the last tab, exit the process instead.
 
 | Argument/Option | Description                                                                            |
 | --------------- | -------------------------------------------------------------------------------------- |
+| `--code [n]`    | Return with exit code `n` (indicating an error) on exit.                               |
 | `--no-cwd-file` | Don't output the current directory to the file specified by `yazi --cwd-file` on exit. |
 
 ### `suspend` {#manager.suspend}