some docs

experimental/bridge/opentracing/doc.go

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+// Copyright 2019, OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This package implements a bridge that forwards opentracing API
+// calls into the opentelemetry SDK.
+//
+// To use the bridge create an OpenTelemetry tracer of your
+// choice. Then use the NewTracerPair function to create two tracers -
+// one implementing OpenTracing API and one that also implements the
+// OpenTelemetry API, but does some extra stuff to make the
+// interaction between both APIs working.
+package opentracing // import "go.opentelemetry.io/experimental/bridge/opentracing"

experimental/bridge/opentracing/internal/doc.go

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+package internal // import "go.opentelemetry.io/experimental/bridge/opentracing/internal"