improve LocalDebugging readme (#137)

motivation: clearer guidelines for using the example

changes: fix a few typos, fix incorrect scheme name and add a bit more prose

Author: tomerd

Examples/LocalDebugging/README.md

@@ -1,10 +1,10 @@
 # Local Debugging Example
 
 This sample project demonstrates how to write a simple Lambda function in Swift,
-and how to use local debugging techniques that emulate how the Lambda function
+and how to use local debugging techniques that simulate how the Lambda function
 would be invoked by the AWS Lambda Runtime engine.
 
-The example includes three modules:
+The example includes an Xcode workspace with three modules:
 
 1. [MyApp](MyApp) is a SwiftUI iOS application that calls the Lambda function.
 2. [MyLambda](MyLambda) is a SwiftPM executable package for the Lambda function.
@@ -16,11 +16,11 @@ debug-only local lambda engine simulator which starts a local HTTP server enabli
 between the iOS application and the Lambda function over HTTP.
 
 To try out this example, open the workspace in Xcode and "run" the two targets,
-using the relevant `MyLambda` and `MyApp` Xcode schemas.
+using the relevant `MyLambda` and `MyApp` Xcode schemes.
 
 Start with running the `MyLambda` target.
-* Switch to the `MyApp` scheme and select the "My Mac" destination
-* Set the `LOCAL_LAMBDA_SERVER_ENABLED` environment variable to `true` by editing the `MyLambda` scheme under `Run`.
+* Switch to the `MyLambda` scheme and select the "My Mac" destination
+* Set the `LOCAL_LAMBDA_SERVER_ENABLED` environment variable to `true` by editing the `MyLambda` scheme Run/Arguments options.
 * Hit `Run`
 * Once it is up you should see a log message in the Xcode console saying
 `LocalLambdaServer started and listening on 127.0.0.1:7000, receiving events on /invoke`