Add note about PROTOC_PATH

Author: glbrntt

Examples/echo/README.md

@@ -16,6 +16,10 @@ HTTP/2 transport.
 
 You must have the Protocol Buffers compiler (`protoc`) installed. You can find
 the instructions for doing this in the [gRPC Swift Protobuf documentation][0].
+The `swift` commands below are all prefixed with `PROTOC_PATH=$(which protoc)`,
+this is to let the build system know where `protoc` is located so that it can
+generate stubs for you. You can read more about it in the [gRPC Swift Protobuf
+documentation][1].
 
 ## Usage
 
@@ -51,3 +55,4 @@ $ PROTOC_PATH=$(which protoc) swift run echo --help
 ```
 
 [0]: https://swiftpackageindex.com/grpc/grpc-swift-protobuf/documentation/grpcprotobuf/installing-protoc
+[1]: https://swiftpackageindex.com/grpc/grpc-swift-protobuf/documentation/grpcprotobuf/generating-stubs

Examples/error-details/README.md

@@ -14,6 +14,10 @@ Guide](https://grpc.io/docs/guides/error/) and is made available via the
 
 You must have the Protocol Buffers compiler (`protoc`) installed. You can find
 the instructions for doing this in the [gRPC Swift Protobuf documentation][0].
+The `swift` commands below are all prefixed with `PROTOC_PATH=$(which protoc)`,
+this is to let the build system know where `protoc` is located so that it can
+generate stubs for you. You can read more about it in the [gRPC Swift Protobuf
+documentation][1].
 
 ## Usage
 
@@ -31,3 +35,4 @@ Error details:
 ```
 
 [0]: https://swiftpackageindex.com/grpc/grpc-swift-protobuf/documentation/grpcprotobuf/installing-protoc
+[1]: https://swiftpackageindex.com/grpc/grpc-swift-protobuf/documentation/grpcprotobuf/generating-stubs

Examples/hello-world/README.md

@@ -14,6 +14,10 @@ HTTP/2 transport.
 
 You must have the Protocol Buffers compiler (`protoc`) installed. You can find
 the instructions for doing this in the [gRPC Swift Protobuf documentation][0].
+The `swift` commands below are all prefixed with `PROTOC_PATH=$(which protoc)`,
+this is to let the build system know where `protoc` is located so that it can
+generate stubs for you. You can read more about it in the [gRPC Swift Protobuf
+documentation][1].
 
 ## Usage
 
@@ -39,3 +43,4 @@ Hello, PanCakes 🐶
 ```
 
 [0]: https://swiftpackageindex.com/grpc/grpc-swift-protobuf/documentation/grpcprotobuf/installing-protoc
+[1]: https://swiftpackageindex.com/grpc/grpc-swift-protobuf/documentation/grpcprotobuf/generating-stubs

Examples/reflection-server/README.md

@@ -27,6 +27,10 @@ protoc --descriptor_set_out=path/to/output.pb path/to/input.proto \
 
 You must have the Protocol Buffers compiler (`protoc`) installed. You can find
 the instructions for doing this in the [gRPC Swift Protobuf documentation][0].
+The `swift` commands below are all prefixed with `PROTOC_PATH=$(which protoc)`,
+this is to let the build system know where `protoc` is located so that it can
+generate stubs for you. You can read more about it in the [gRPC Swift Protobuf
+documentation][1].
 
 ## Usage
 
@@ -66,3 +70,4 @@ $ grpcurl -plaintext -d '{ "text": "Hello" }' 127.0.0.1:31415 echo.Echo.Get
 ```
 
 [0]: https://swiftpackageindex.com/grpc/grpc-swift-protobuf/documentation/grpcprotobuf/installing-protoc
+[1]: https://swiftpackageindex.com/grpc/grpc-swift-protobuf/documentation/grpcprotobuf/generating-stubs

Examples/route-guide/README.md

@@ -19,6 +19,10 @@ Index](https://swiftpackageindex.com/grpc/grpc-swift/main/tutorials/grpccore/rou
 
 You must have the Protocol Buffers compiler (`protoc`) installed. You can find
 the instructions for doing this in the [gRPC Swift Protobuf documentation][0].
+The `swift` commands below are all prefixed with `PROTOC_PATH=$(which protoc)`,
+this is to let the build system know where `protoc` is located so that it can
+generate stubs for you. You can read more about it in the [gRPC Swift Protobuf
+documentation][1].
 
 ## Usage
 
@@ -49,3 +53,4 @@ SUBCOMMANDS:
 ```
 
 [0]: https://swiftpackageindex.com/grpc/grpc-swift-protobuf/documentation/grpcprotobuf/installing-protoc
+[1]: https://swiftpackageindex.com/grpc/grpc-swift-protobuf/documentation/grpcprotobuf/generating-stubs