Merge and fix CHANGELOG.

Signed-off-by: owent <admin@owent.net>

CHANGELOG.md

@@ -19,7 +19,14 @@ Increment the:
   [#2036](https://github.com/open-telemetry/opentelemetry-cpp/pull/2036)
 * [EXPORTERS]Add `ForceFlush` for `LogRecordExporter` and `SpanExporter`
   [#2000](https://github.com/open-telemetry/opentelemetry-cpp/pull/2000)
-
+
+Important changes:
+
+* `LogRecordExporter` and `SpanExporter` add a new virtual function `ForceFlush`
+  , and if users implement any customized `LogRecordExporter` and `SpanExporter`
+  , they should also implement this function.There should be no influence if
+  users only use factory to create exporters.
+
 ## [1.8.3] 2023-03-06
 
 * Provide version major/minor/patch macros
@@ -71,13 +78,6 @@ Increment the:
 * [EXPORTER] Opentracing shim
   [#1909](https://github.com/open-telemetry/opentelemetry-cpp/pull/1909)
 
-Important changes:
-
-* `LogRecordExporter` and `SpanExporter` add a new pure virtual function
-  `ForceFlush`, and if users implement any customized `LogRecordExporter` and
-  `SpanExporter`, they should also implement this function.There should be no
-  influence if users only use factory to create exporters.
-
 ## [1.8.2] 2023-01-31
 
 * Remove redundant macro check in nostd::shared_ptr [#1939](https://github.com/open-telemetry/opentelemetry-cpp/pull/1939)