Prepare changelog for 1.40.0 release (#6554)

open-telemetry · Jul 5, 2024 · c48fe94 · c48fe94
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 ## Unreleased
 
+### API
+
+#### Incubator
+
+* Narrow ExtendedSpanBuilder return types for chaining
+  ([#6514](https://github.com/open-telemetry/opentelemetry-java/pull/6514))
+* Add APIs to determine if tracer, logger, instruments are enabled
+  ([#6502](https://github.com/open-telemetry/opentelemetry-java/pull/6502))
+
+### SDK
+
+#### Extensions
+
+* Move autoconfigure docs to opentelemetry.io
+  ([#6491](https://github.com/open-telemetry/opentelemetry-java/pull/6491))
+
 ## Version 1.39.0 (2024-06-07)
 
 ### API