s/makefile/Makefile

examples/cpp/cpptutorial.md

@@ -127,7 +127,7 @@ Next we need to generate the gRPC client and server interfaces from our `.proto`
 service definition. We do this using the protocol buffer compiler `protoc` with
 a special gRPC C++ plugin.
 
-For simplicity, we've provided a [makefile](route_guide/Makefile) that runs
+For simplicity, we've provided a [Makefile](route_guide/Makefile) that runs
 `protoc` for you with the appropriate plugin, input, and output (if you want to
 run this yourself, make sure you've installed protoc and followed the gRPC code
 [installation instructions](../../INSTALL.md) first):