Fixed typo for default service name in Jaeger Exporter (#1797)

* Fix typo in jaeger exporter

* Update changelog

* Add PR number to changelog

* Move entry in changelog to Fixed

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

CHANGELOG.md

@@ -46,6 +46,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - The Jaeger exporter now correctly records Span event's names using the `"event"` key for a tag.
   Additionally, this tag is overridden, as specified in the OTel specification, if the event contains an attribute with that key. (#1768)
 - Zipkin Exporter: Ensure mapping between OTel and Zipkin span data complies with the specification. (#1688)
+- Fixed typo for default service name in Jaeger Exporter. (#1797)
 
 ### Changed
 

exporters/trace/jaeger/jaeger.go

@@ -490,7 +490,7 @@ func process(res *resource.Resource, defaultServiceName string) *gen.Process {
 	// If no service.name is contained in a Span's Resource,
 	// that field MUST be populated from the default Resource.
 	if serviceName.Value.AsString() == "" {
-		serviceName = semconv.ServiceVersionKey.String(defaultServiceName)
+		serviceName = semconv.ServiceNameKey.String(defaultServiceName)
 	}
 	process.ServiceName = serviceName.Value.AsString()