update go documentation badge image (#1322)

Signed-off-by: Andrew Hsu <xuzuan@gmail.com>

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

README.md

@@ -1,7 +1,7 @@
 # OpenTelemetry-Go
 
 [![Circle CI](https://circleci.com/gh/open-telemetry/opentelemetry-go.svg?style=svg)](https://circleci.com/gh/open-telemetry/opentelemetry-go)
-[![Docs](https://godoc.org/go.opentelemetry.io/otel?status.svg)](https://pkg.go.dev/go.opentelemetry.io/otel)
+[![PkgGoDev](https://pkg.go.dev/badge/go.opentelemetry.io/otel)](https://pkg.go.dev/go.opentelemetry.io/otel)
 [![Go Report Card](https://goreportcard.com/badge/go.opentelemetry.io/otel)](https://goreportcard.com/report/go.opentelemetry.io/otel)
 [![Gitter](https://badges.gitter.im/open-telemetry/opentelemetry-go.svg)](https://gitter.im/open-telemetry/opentelemetry-go?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
 

exporters/otlp/README.md

@@ -1,7 +1,6 @@
 # OpenTelemetry Collector Go Exporter
 
-[![GoDoc](https://godoc.org/go.opentelemetry.io/otel?status.svg)](https://pkg.go.dev/go.opentelemetry.io/otel/exporters/otlp)
-
+[![PkgGoDev](https://pkg.go.dev/badge/go.opentelemetry.io/otel/exporters/otlp)](https://pkg.go.dev/go.opentelemetry.io/otel/exporters/otlp)
 
 This exporter exports OpenTelemetry spans and metrics to the OpenTelemetry Collector.