revised README.md

README.md

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 #ZCW-MicroLabs-ExceptionsAndLogging
 
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 * Note: Phone numbers are a composite of 3 affixes; `Area Code`, `Central Office Code`, and `Phone Line Code`.
 	* `Area Code`  - the first 3 numeric values
 	* `Central Office Code` - the 4th, 5th, and 6th numeric values.
-	* `Phone Line Code` - the last 3 numeric values. 
+	* `Phone Line Code` - the last 4 numeric values. 
 
 * Below is a sample *instantation of* and *invokation on* `PhoneNumber`.