protoc-gen-apidocs is a very simple and customizable protoc generator that translates .proto files into clean and readable markdown format.
This is achieved by levearging the fantastic protogen library and Go's built-in templating capabilties.
Vehicle.proto example
This example shows a variety of protobuf features including extensions and nested messages.
Booking.proto example
This example is relatively simple but shows streaming rpc endpoints properly handled.