fix: correct a typo, mertrics->metrics (open-telemetry#30288)

corrects a typo and changes `mertricExportNativeClientFeatureGate` to
`metricExportNativeClientFeatureGate`

exporter/datadogexporter/factory.go

@@ -31,7 +31,7 @@ import (
 	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/resourcetotelemetry"
 )
 
-var mertricExportNativeClientFeatureGate = featuregate.GlobalRegistry().MustRegister(
+var metricExportNativeClientFeatureGate = featuregate.GlobalRegistry().MustRegister(
 	"exporter.datadogexporter.metricexportnativeclient",
 	featuregate.StageBeta,
 	featuregate.WithRegisterDescription("When enabled, metric export in datadogexporter uses native Datadog client APIs instead of Zorkian APIs."),
@@ -46,17 +46,17 @@ var noAPMStatsFeatureGate = featuregate.GlobalRegistry().MustRegister(
 
 // isMetricExportV2Enabled returns true if metric export in datadogexporter uses native Datadog client APIs, false if it uses Zorkian APIs
 func isMetricExportV2Enabled() bool {
-	return mertricExportNativeClientFeatureGate.IsEnabled()
+	return metricExportNativeClientFeatureGate.IsEnabled()
 }
 
 // enableNativeMetricExport switches metric export to call native Datadog APIs instead of Zorkian APIs.
 func enableNativeMetricExport() error {
-	return featuregate.GlobalRegistry().Set(mertricExportNativeClientFeatureGate.ID(), true)
+	return featuregate.GlobalRegistry().Set(metricExportNativeClientFeatureGate.ID(), true)
 }
 
 // enableZorkianMetricExport switches metric export to call Zorkian APIs instead of native Datadog APIs.
 func enableZorkianMetricExport() error {
-	return featuregate.GlobalRegistry().Set(mertricExportNativeClientFeatureGate.ID(), false)
+	return featuregate.GlobalRegistry().Set(metricExportNativeClientFeatureGate.ID(), false)
 }
 
 const metadataReporterPeriod = 30 * time.Minute