Closes: #2951

This PR updates the example listed in the getting started doc
so that it will compile without error.  It also makes this
example consistent with the code found in
https://github.com/open-telemetry/opentelemetry-go/blob/main/example/fib/main.go

Signed-off-by: Brad Topol <btopol@us.ibm.com>

website_docs/getting-started.md

@@ -284,6 +284,7 @@ import (
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
 	"go.opentelemetry.io/otel/sdk/trace"
+	semconv "go.opentelemetry.io/otel/semconv/v1.10.0"
 )
 ```