Update file README.md

p2/README.md

@@ -74,7 +74,7 @@ should attempt to use the other dataset server to obtain the result.
 
 ## Part 1: gRPC Server (Dataset Layer)
 
-Define an RPC service in a .proto file called "PropertyLookup".  It
+Define an RPC service called "PropertyLookup" in a .proto file.  It
 should have a single RPC call named "LookupByZip".  This method should
 accept a `zip` and `limit` (both int32 values) and return addresses in
 a "repeated string" field.