[8.14] Update 8.15 changelog diff link (backport #13680)

changelogs/8.15.asciidoc

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+[[apm-release-notes-8.15]]
+== APM version 8.15
+* <<apm-release-notes-8.15.0>>
+
+[float]
+[[apm-release-notes-8.15.0]]
+=== APM version 8.15.0
+
+https://github.com/elastic/apm-server/compare/v8.14.3\...v8.15.0[View commits]
+
+[float]
+==== Bug fixes
+
+- Avoid data race due to reuse of `bytes.Buffer` in ES bulk requests {pull}13155[13155]
+- APM Server now relies on the Elasticsearch apm-data plugin's index templates, which reverts some unsafe uses of `flattened` field types {pull}12066[12066]
+- Add `error.id` to jaeger errors {pull}13196[13196]
+- Process `host.ip` resource attribute for OTel {pull}13614[13614]
+
+[float]
+==== Breaking Changes
+
+[float]
+==== Deprecations
+
+[float]
+==== Intake API Changes
+
+[float]
+==== Added
+
+- Add `elasticsearch.flushed.uncompressed.bytes` metric {pull}13155[13155]
+- APM Server now relies on the Elasticsearch apm-data plugin's index templates, removing the requirement to install the APM integration package {pull}12066[12066]
+- Upgraded bundled APM Java agent attacher CLI to version 1.50.0 {pull}13326[13326]
+- Enable Kibana curated UIs to work with hostmetrics from OpenTelemetry's https://pkg.go.dev/go.opentelemetry.io/collector/receiver/hostmetricsreceiver[hostmetricsreceiver] {pull}13196[13196]
+- Add require data stream to bulk index requests {pull}13398[13398]
+- Support self-instrumentation when in managed mode by getting tracing configs via reloader {pull}13514[13514] {pull}13653[13653]
+- Add mapping for OpenTelemetry attribute `messaging.destination.name` to derive `service.target` correctly {pull}13472[13472]