Prepare changelog for release 1.40.0

Author: apmmachine

CHANGELOG.asciidoc

@@ -31,6 +31,12 @@ Use subheadings with the "=====" level for adding notes for unreleased changes:
 
 === Unreleased
 
+[[release-notes-1.x]]
+=== Java Agent version 1.x
+
+[[release-notes-1.40.0]]
+==== 1.40.0 - 2023/07/19
+
 [float]
 ===== Features
 * Capture `container.id` for cgroups v2 - {pull}3199[#3199]
@@ -47,9 +53,6 @@ Use subheadings with the "=====" level for adding notes for unreleased changes:
 * Avoid warning log message when grpc transactions are cancelled before end - {pull}3223[#3223]
 * Align agent hostname capture to FQDN - {pull}3188[#3188]
 
-[[release-notes-1.x]]
-=== Java Agent version 1.x
-
 [[release-notes-1.39.0]]
 ==== 1.39.0 - 2023/06/13
 
@@ -1675,4 +1678,4 @@ Transactions are named based on your resources (`ResourceClass#resourceMethod`).
    you will still want to set the `service_name` explicitly.
    But it helps getting started and seeing data easier,
    as there are no required configuration options anymore.
-   In the future we will most likely determine more useful application names for Servlet API-based applications.
+   In the future we will most likely determine more useful application names for Servlet API-based applications.