Remove inaccurate and unnecessary import comment (#1481)

Based on its module, it should be go.opencensus.io/otel/example/opencensus.
However, it's simpler to get rid of it since main packages shouldn't be imported at all.

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

example/opencensus/main.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package main // import "go.opentelemetry.io/otel/bridge/opencensus/examples/simple"
+package main
 
 import (
 	"context"