[prometheus] Stabilize SDK exporter port config (#5026)

Fixes #4985

## Changes

Moves Prometheus Metrics Exporter spec **Port configuration** status
from `Development` to `Stable`. Implemented by [3+
SDKs](#4985 (comment)).

* [x] Related issues #4985
* [ ] Related [OTEP(s)](https://github.com/open-telemetry/oteps) #
* [ ] Links to the prototypes (when adding or changing features)
* [x]
[`CHANGELOG.md`](https://github.com/open-telemetry/opentelemetry-specification/blob/main/CHANGELOG.md)
file updated for non-trivial changes
* For trivial changes, include `[chore]` in the PR title to skip the
changelog check
* [ ] [Spec compliance
matrix](https://github.com/open-telemetry/opentelemetry-specification/blob/main/spec-compliance-matrix/template.yaml)
updated if necessary
* [ ] [Declarative config data
model](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/data-model.md#overview)
is updated if SDK config surface is changed

Co-authored-by: Jack Berg <34418638+jack-berg@users.noreply.github.com>

Author: johannaojeling

CHANGELOG.md

@@ -13,6 +13,10 @@ release.
 
 ### Metrics
 
+- Stabilize sections of Prometheus Metrics Exporter.
+  - Stabilize port configuration.
+    ([#4985](https://github.com/open-telemetry/opentelemetry-specification/issues/4985))
+
 ### Logs
 
 ### Baggage
@@ -60,6 +64,12 @@ release.
 
 - Add development `maxExportBatchSize` parameter to Periodic exporting MetricReader.
   ([#4895](https://github.com/open-telemetry/opentelemetry-specification/pull/4895))
+- Stabilize sections of Prometheus Metrics Exporter.
+  - Stabilize temporality.
+    ([#4983](https://github.com/open-telemetry/opentelemetry-specification/issues/4983))
+  - Stabilize host configuration.
+    ([#4984](https://github.com/open-telemetry/opentelemetry-specification/issues/4984))
+    ([#5025](https://github.com/open-telemetry/opentelemetry-specification/pull/5025))
 
 ### Logs
 
@@ -102,11 +112,6 @@ release.
     ([#4966](https://github.com/open-telemetry/opentelemetry-specification/pull/4966))
   - Stabilize OpenTelemetry Exemplar to Prometheus Exemplar transformation.
     ([#4964](https://github.com/open-telemetry/opentelemetry-specification/pull/4964))
-- Stabilize sections of Prometheus Metrics Exporter.
-  - Stabilize temporality.
-    ([#4983](https://github.com/open-telemetry/opentelemetry-specification/issues/4983))
-  - Stabilize host configuration.
-    ([#5025](https://github.com/open-telemetry/opentelemetry-specification/pull/5025))
 
 ### SDK Configuration
 

specification/metrics/sdk_exporters/prometheus.md

@@ -110,7 +110,7 @@ by default.
 
 ### Port
 
-**Status**: [Development](../../document-status.md)
+**Status**: [Stable](../../document-status.md)
 
 A Prometheus Exporter SHOULD support a configuration option to set the port
 that metrics are served on. The option MAY be named `port`, and MUST be `9464` by