docs: fix some typos (#1852)

Signed-off-by: cuishuang <imcusg@gmail.com>

README.md

@@ -39,7 +39,7 @@ Kratos is accessible, powerful, and provides tools required for large, robust ap
 
 Kratos has the most extensive and thorough [documentation](https://go-kratos.dev/en/docs/getting-started/start) and [example](./examples) library of all modern web application frameworks, making it a breeze to get started with the framework.
 
-We also provide a [moderm template](https://github.com/go-kratos/kratos-layout), This template should help reduce the work required to setup up a modern project.
+We also provide a [modern template](https://github.com/go-kratos/kratos-layout), This template should help reduce the work required to setup up a modern project.
 
 ### Goals
 

api/metadata/metadata.proto

@@ -11,7 +11,7 @@ option java_package = "com.github.kratos.api";
 option objc_class_prefix = "KratosAPI";
 
 
-// Metadata is api defintion metadata service.
+// Metadata is api definition metadata service.
 service Metadata {
   // ListServices list the full name of all services.
   rpc ListServices (ListServicesRequest) returns (ListServicesReply)  {

examples/http/middlewares/main.go

@@ -22,7 +22,7 @@ func main() {
 		// add global filter
 		http.Filter(globalFilter, globalFilter2),
 	)
-	// register http hanlder to http server
+	// register http handler to http server
 	helloworld.RegisterGreeterHTTPServer(httpSrv, s)
 
 	// add route filter