add name suggestion to prometheus exporter option (#3837)

## Changes

Similarly to the other options listed in the Prometheus exporter
specification, adding a suggested name for the option to apply resource
attributes as metric attributes.

CHANGELOG.md

@@ -13,6 +13,9 @@ release.
 
 ### Metrics
 
+- Add name suggestion for option to apply resource attributes as metric attributes in Prometheus exporter.
+  ([#3837](https://github.com/open-telemetry/opentelemetry-specification/pull/3837))
+
 ### Logs
 
 ### Events

specification/metrics/sdk_exporters/prometheus.md

@@ -44,7 +44,7 @@ A Prometheus Exporter MAY offer configuration to add resource attributes as metr
 By default, it MUST NOT add any resource attributes as metric attributes.
 The configuration SHOULD allow the user to select which resource attributes to copy (e.g.
 include / exclude or regular expression based). Copied Resource attributes MUST NOT be
-excluded from the `target` info metric.
+excluded from the `target` info metric. The option MAY be named `with_resource_constant_labels`.
 
 A Prometheus Exporter MAY support a configuration option to produce metrics without a [unit suffix](../../compatibility/prometheus_and_openmetrics.md#metric-metadata)
 or UNIT metadata. The option MAY be named `without_units`, and MUST be `false` by default.