Document "automatic" as a value for the CloseOnExit setting (#791)

Closes #661

TerminalDocs/customize-settings/profile-advanced.md

@@ -104,15 +104,17 @@ ___
 
 ## Profile termination behavior
 
-This sets how the profile reacts to termination or failure to launch. `"graceful"` will close the profile when `exit` is typed or when the process exits normally. `"always"` will always close the profile and `"never"` will never close the profile. `true` and `false` are accepted as synonyms for `"graceful"` and `"never"`, respectively.
+This sets how the profile reacts to termination or failure to launch. `"graceful"` will close the profile when `exit` is typed or when the process exits normally. `"always"` will always close the profile and `"never"` will never close the profile. `"automatic"` was added once Windows Terminal was allowed to be the default terminal application; for processes launched in Terminal directly, it behaves the same as `"graceful"` but for processes that were handed off to Terminal it behaves the same as `"always"`.
+
+`true` and `false` are accepted as synonyms for `"graceful"` and `"never"`, respectively.
 
 **Property name:** `closeOnExit`
 
 **Necessity:** Optional
 
-**Accepts:** `"graceful"`, `"always"`, `"never"`, `true`, `false`
+**Accepts:** `"automatic"`, `"graceful"`, `"always"`, `"never"`, `true`, `false`
 
-**Default value:** `"graceful"`
+**Default value:** `"automatic"`
 
 > [!NOTE]
 > In Windows Command Prompt (cmd.exe), `exit` will return the return code of the previous command. If the command you typed before `exit` resulted in an error, then `"closeOnExit": "graceful"` will still show that error code, instead of closing the tab.