docs: migrate changelog entry to towncrier fragment

Address @emdneto's feedback: replace direct CHANGELOG.md edit with a
.changelog/5017.fixed fragment per the new towncrier workflow added in
#5187.

Author: raajheshkannaa

.changelog/5017.fixed

@@ -0,0 +1,2 @@
+Add missing `.rst` files to Sphinx documentation build for SDK logs,
+propagators, and exporter submodules.

CHANGELOG.md

@@ -54,8 +54,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#5120](https://github.com/open-telemetry/opentelemetry-python/pull/5120))
 - Add WeaverLiveCheck test util
   ([#5088](https://github.com/open-telemetry/opentelemetry-python/pull/5088))
-- Add missing .rst files to Sphinx documentation build for SDK logs, propagators, and exporter submodules
-  ([#5017](https://github.com/open-telemetry/opentelemetry-python/pull/5017))
 - Fix incorrect type annotation on `detectors` parameter of `get_aggregated_resources`
   ([#5135](https://github.com/open-telemetry/opentelemetry-python/pull/5135))
 - ci: wait for tracecontext server readiness instead of a fixed sleep in `scripts/tracecontext-integration-test.sh`