Fixed manual install instructions for S3 forwarder

There were some mistakes and omissions in the manual install instructions. The commit fixes them.

src/content/docs/logs/forward-logs/aws-lambda-sending-logs-s3.mdx

@@ -43,13 +43,15 @@ npm install
 # Set the New Relic License Key env variable
 export LICENSE_KEY=<var>YOUR_NEWRELIC_LICENSE_KEY</var>
 # Set the logtype (optional)
-export LOGTYPE=<var>YOUR_LOGTYPE</var>
+export LOG_TYPE=<var>YOUR_LOGTYPE</var>
 # Set the S3 bucket name
 export S3_BUCKET_NAME=<var>YOUR_S3_BUCKET_NAME</var>
 # The S3 subdirectory (optional)
 export S3_PREFIX=<var>YOUR_S3_SUBDIRECTORY</var>
-# Deploy the function
-serverless deploy
+# Choose a name for your new Serverless Framework service
+export SERVICE_NAME=<var>YOUR_SERVICE_NAME</var>
+# Deploy the function, specifying the same region as your S3 bucket listed above
+serverless deploy --region <var>YOUR_AWS_REGION</var>
 ```
 
 ## Create a Lambda trigger in AWS [#create-trigger]