Update API docs

docs/api.md

@@ -30,6 +30,12 @@ Finally, **system information and configuration** is available via a set of spec
 
 Here major and breaking changes to the API are listed by version.
 
+### ODK Central v2023.4
+
+**Added**:
+
+- [DELETE /sessions/current](/reference/authentication/session-authentication/logging-out-current-session) logs out the current session.
+
 ### ODK Central v2023.3
 
 **Added**:
@@ -420,9 +426,6 @@ Only the session that was used to authenticate the request is logged out. If the
 + Response 403 (application/json)
     + Attributes (Error 403)
 
-+ Response 404 (application/json)
-    + Attributes (Error 404)
-
 ## HTTPS Basic Authentication [/v1/example]
 
 Standard HTTP Basic Authentication is allowed, but **_strongly discouraged_**. This is because the server must verify your password with every single request, which is very slow to compute: typically, this will add hundreds of milliseconds to each request. For some one-off tasks and in cases where there is no other choice, it is reasonable to choose Basic authentication, but wherever possible we strongly encourage the use of any other authentication method.