Fix several example typos in the README (#602)
Fix several example typos in the README (#602)

* Zipkin receiver takes endpoint, not address

Signed-off-by: Irving Popovetsky <f0d8265086dd7c027dd9c71be8fa9e555599bd83@honeycomb.io>

* jaeger_grpc endpoint can't have http:// in it, in fact that causes an error

Signed-off-by: Irving Popovetsky <f0d8265086dd7c027dd9c71be8fa9e555599bd83@honeycomb.io>

* Also fix opencensus address -> endpoint

Signed-off-by: Irving Popovetsky <f0d8265086dd7c027dd9c71be8fa9e555599bd83@honeycomb.io>
open-telemetry/opentelemetry-collector-contrib,open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector-contrib,open-telemetry/opentelemetry-collector