doc: mention HTTP JSON in doc link
It is not clear to users immediately what is the gRPC
gateway. Adding a more explaination to make it clear that
etcd3 supports HTTP API through the gateway.
@@ -12,8 +12,8 @@ The easiest way to get started using etcd as a distributed key-value store is to
- [Setting up local clusters][local_cluster]
- [Interacting with etcd][interacting]
- - [API references][api_ref]
- - [gRPC gateway][api_grpc_gateway]
+ - [gRPC API references][api_ref]
+ - [HTTP JSON API through the gRPC gateway][api_grpc_gateway]
- [gRPC naming and discovery][grpc_naming]
- [Embedding etcd][embed_etcd]
- [Experimental features and APIs][experimental]
