docs(kitex): capitalize Protobuf in both Chinese and English streaming documents

Author: XinyiWang0204

content/en/docs/kitex/Tutorials/advanced-feature/generic-call/generic_streaming.md

@@ -14,7 +14,7 @@ description: ""
 
 ### Generic Streaming Client Initialization
 
-#### protobuf
+#### Protobuf
 
 Take the following Protobuf IDL as an example:
 
@@ -280,17 +280,17 @@ strResp, ok := resp.(string) // response is json string
 
 ### Recv() got err: rpc error: code = 12 desc = Method not found!
 
-This error occurs when calling with Kitex **protobuf** generic streaming when the downstream is **gRPC-python** (gRPC libraries for other languages may also have this problem).
+This error occurs when calling with Kitex **Protobuf** generic streaming when the downstream is **gRPC-python** (gRPC libraries for other languages may also have this problem).
 
-The root cause is that Kitex does not parse the package in the protobuf idl, so the package part of `:path` in the gPRC request is missing, and gRPC-python can't find the corresponding method.
+The root cause is that Kitex does not parse the package in the Protobuf IDL, so the package part of `:path` in the gPRC request is missing, and gRPC-python can't find the corresponding method.
 
 e.g.
 
 - normal client
 
 `:path` - /search.gpt_engine.GPTStreamService/GPTGeneration
 
-- protobuf generic client
+- Protobuf generic client
 
 `:path` - /GPTStreamService/GPTGeneration
 

content/zh/docs/kitex/Tutorials/advanced-feature/generic-call/generic_streaming.md

@@ -14,7 +14,7 @@ description: ""
 
 ### 泛化流式客户端初始化
 
-#### protobuf
+#### Protobuf
 
 以如下 Protobuf IDL 为例：
 
@@ -294,17 +294,17 @@ strResp, ok := resp.(string) // 响应为 json 字符串
 
 ### Recv() got err: rpc error: code = 12 desc = Method not found!
 
-该错误出现在 Kitex **protobuf** 泛化流式调用下游为 **gRPC-python**（或其他语言 gRPC 库）时。
+该错误出现在 Kitex **Protobuf** 泛化流式调用下游为 **gRPC-python**（或其他语言 gRPC 库）时。
 
-根因是 Kitex 没有解析 protobuf idl 的 package，导致 gRPC 请求的 `:path` 缺少 package 部分，gRPC-python 找不到对应方法。
+根因是 Kitex 没有解析 Protobuf IDL 的 package，导致 gRPC 请求的 `:path` 缺少 package 部分，gRPC-python 找不到对应方法。
 
 例如：
 
 - 普通客户端
 
 `:path` - /search.gpt_engine.GPTStreamService/GPTGeneration
 
-- protobuf 泛化客户端
+- Protobuf 泛化客户端
 
 `:path` - /GPTStreamService/GPTGeneration