apply review's suggestion

Author: Frapschen

.chloggen/fix-42462.yaml

@@ -20,9 +20,10 @@ subtext: |
   Currently, the feature gate is enabled by default, so the unit will remain `ms`. After one or two release cycles, the unit will switch to `s` and the feature gate will also be disabled by default.
   To revert this change manually, users can either enable the feature gate or modify the configuration as follows:
   ```
-  spanmetrics:
-  histogram:
-    unit: "ms"
+  connectors
+    spanmetrics:
+      histogram:
+        unit: "ms"
   ```
 
 # If your change doesn't affect end users or the exported elements of any package,

connector/spanmetricsconnector/factory.go

@@ -50,7 +50,7 @@ func init() {
 	)
 	legacyDefaultMetricsUnit = featuregate.GlobalRegistry().MustRegister(
 		legacyDefaultMetricsUnitFeatureGateID,
-		featuregate.StageBeta, // current enabled by default and disable it in the feature release
+		featuregate.StageBeta, // current enabled by default and disable it in the next release
 		featuregate.WithRegisterDescription("enabled by default, connector use ms unit for duration metrics."),
 		featuregate.WithRegisterReferenceURL("https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/42103"),
 	)