Merge pull request #522 from brpc/h2_docs

H2 docs

docs/cn/client.md

@@ -579,11 +579,11 @@ Channel的默认协议是baidu_std，可通过设置ChannelOptions.protocol换
 - PROTOCOL_BAIDU_STD 或 “baidu_std"，即[百度标准协议](baidu_std.md)，默认为单连接。
 - PROTOCOL_HTTP 或 ”http", http/1.0或http/1.1协议，默认为连接池(Keep-Alive)。
   - 访问普通http服务的方法见[访问http/h2服务](http_client.md)
-  - 通过http:json或http:proto访问pb服务的方法见[基于http/h2的协议](http_derivatives.md)
+  - 通过http:json或http:proto访问pb服务的方法见[http/h2衍生协议](http_derivatives.md)
 - PROTOCOL_H2 或 ”h2", http/2.0协议，默认是单连接。
   - 访问普通h2服务的方法见[访问http/h2服务](http_client.md)。
-  - 通过h2:json或h2:proto访问pb服务的方法见[基于http/h2的协议](http_derivatives.md)
-- "h2:grpc", [gRPC](https://grpc.io)的协议，也是h2的衍生协议，默认为单连接，具体见[基于http/h2的协议](http_derivatives.md)。
+  - 通过h2:json或h2:proto访问pb服务的方法见[http/h2衍生协议](http_derivatives.md)
+- "h2:grpc", [gRPC](https://grpc.io)的协议，也是h2的衍生协议，默认为单连接，具体见[h2:grpc](http_derivatives.md#h2grpc)。
 - PROTOCOL_THRIFT 或 "thrift"，[apache thrift](https://thrift.apache.org)的协议，默认为连接池, 具体方法见[访问thrift](thrift.md)。
 - PROTOCOL_MEMCACHE 或 "memcache"，memcached的二进制协议，默认为单连接。具体方法见[访问memcached](memcache_client.md)。
 - PROTOCOL_REDIS 或 "redis"，redis 1.2后的协议(也是hiredis支持的协议)，默认为单连接。具体方法见[访问Redis](redis_client.md)。

docs/cn/http_derivatives.md

 [English version](../en/http_derivatives.md)
 
-http协议的基本用法见[http_client](http_client.md)和[http_service](http_service.md)
+http/h2协议的基本用法见[http_client](http_client.md)和[http_service](http_service.md)
 
 下文中的小节名均为可填入ChannelOptions.protocol中的协议名。冒号后的内容是协议参数，用于动态选择衍生行为，但基本协议仍然是http/1.x或http/2，故这些协议在服务端只会被显示为http或h2/h2c。
 

docs/en/client.md

@@ -588,13 +588,13 @@ The default protocol used by Channel is baidu_std, which is changeable by settin
 - PROTOCOL_BAIDU_STD or "baidu_std", which is [the standard binary protocol inside Baidu](baidu_std.md), using single connection by default.
 - PROTOCOL_HTTP or "http", which is http/1.0 or http/1.1, using pooled connection by default (Keep-Alive).
   - Methods for accessing ordinary http services are listed in [Access http/h2](http_client.md).
-  - Methods for accessing pb services by using http:json or http:proto are listed in [Protocols based on http/h2](http_derivatives.md)
+  - Methods for accessing pb services by using http:json or http:proto are listed in [http/h2 derivatives](http_derivatives.md)
 - PROTOCOL_H2 or ”h2", which is http/2.0, using single connection by default.
   - Methods for accessing ordinary h2 services are listed in [Access http/h2](http_client.md).
-  - Methods for accessing pb services by using h2:json or h2:proto are listed in [Protocols based on http/h2](http_derivatives.md)
-- "h2:grpc", which is the protocol of [gRPC](https://grpc.io) and based on h2, using single connection by default, check out [Protocols based on http/h2](http_derivatives.md) for details.
-- PROTOCOL_THRIFT or "thrift", which is the protocol of [apache thrift](https://thrift.apache.org), using pooled connection by default, check out [access thrift](thrift.md) for details.
-- PROTOCOL_MEMCACHE or "memcache", which is binary protocol of memcached, using **single connection** by default. Check out [access memcached](memcache_client.md) for details.
+  - Methods for accessing pb services by using h2:json or h2:proto are listed in [http/h2 derivatives](http_derivatives.md)
+- "h2:grpc", which is the protocol of [gRPC](https://grpc.io) and based on h2, using single connection by default, check out [h2:grpc](http_derivatives.md#h2grpc) for details.
+- PROTOCOL_THRIFT or "thrift", which is the protocol of [apache thrift](https://thrift.apache.org), using pooled connection by default, check out [Access thrift](thrift.md) for details.
+- PROTOCOL_MEMCACHE or "memcache", which is binary protocol of memcached, using **single connection** by default. Check out [Access memcached](memcache_client.md) for details.
 - PROTOCOL_REDIS or "redis", which is protocol of redis 1.2+ (the one supported by hiredis), using **single connection** by default. Check out [Access Redis](redis_client.md) for details.
 - PROTOCOL_HULU_PBRPC or "hulu_pbrpc", which is protocol of hulu-pbrpc, using single connection by default.
 - PROTOCOL_NOVA_PBRPC or "nova_pbrpc",  which is protocol of Baidu ads union, using pooled connection by default.

docs/en/http_derivatives.md

 [中文版](../cn/http_derivatives.md)
 
-Basics for accessing and serving http in brpc are listed in [http_client](http_client.md) and [http_service](http_service.md).
+Basics for accessing and serving http/h2 in brpc are listed in [http_client](http_client.md) and [http_service](http_service.md).
 
 Following section names are protocol names that can be directly set to ChannelOptions.protocol. The content after colon is parameters for the protocol to select derivative behaviors dynamically, but the base protocol is still http/1.x or http/2. As a result, these protocols are displayed at server-side as http or h2/h2c only.