Clarify readme and remove default insight number

Author: chintogtokh

README.md

@@ -1,18 +1,18 @@
-# Nexmo CURL Examples
+# Nexmo cURL Examples
 
 This repository is a collection of things you can do with [Nexmo's](https://nexmo.com) APIs, all shown with cURL.
 
 ## Pre-requisites
 
 You will need [cURL](https://curl.haxx.se/) installed.
 
-Copy `config.sh` to `config.local.sh` and edit it with your own configuration values.
+You can either directly edit the `config.sh` file and add in your configuration values, or you can create a `config.local.sh` file, which will override the main config file.
 
 If you don't already have a Nexmo account, you'll need one! You can find the API key and secret for your configuration settings on the [Dashboard](https://dashboard.nexmo.com).
 
 ## Run the code snippets
 
-Each example includes the `config.sh` and then the `config.local.sh` files. Run them from the directory they reside in, for example:
+As each example requires the aforementioned config files, you must run them from the directory they reside in, for example:
 
 ```
 cd messaging/sms/

config.sh

@@ -9,7 +9,7 @@ TO_NUMBER=""
 FROM_NUMBER=""
 NEXMO_NUMBER=""
 
-# For FaceBook messaging
+# For Facebook messaging
 FB_SENDER_ID=""
 FB_RECIPIENT_ID=""
 
@@ -31,7 +31,7 @@ DATE_FROM="2018-07-01"
 DATE_TO="2018-08-01"
 
 # Number Insight API
-INSIGHT_NUMBER="447700900000"
+INSIGHT_NUMBER=""
 WEBHOOK_URL=""
 
 # MMS