Fix getting-started.md with the correct import packages in main.go (#…

…3354)

* Fix getting-started.md with the correct import packages in main.go

* Update CHANGELOG.md

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

website_docs/getting-started.md

@@ -280,9 +280,12 @@ import (
 	"io"
 	"log"
 	"os"
+	"os/signal"
 
 	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
+	"go.opentelemetry.io/otel/sdk/resource"
 	"go.opentelemetry.io/otel/sdk/trace"
 	semconv "go.opentelemetry.io/otel/semconv/v1.12.0"
 )