Update 20480C_MOD07_DEMO.md

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Author: FinastraProject

Instructions/20480C_MOD07_DEMO.md

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 # Module 7: Creating Objects and Methods by Using JavaScript
 
+Wherever a path to a file starts with *[Repository Root]*, replace it with the absolute path to the folder in which the 20480 repository resides. For example, if you cloned or extracted the 20480 repository to **C:\Users\John Doe\Downloads\20480**, change the path: **[Repository Root]\AllFiles\20480C\Mod01** to **C:\Users\John Doe\Downloads\20480\AllFiles\20480C\Mod01**.
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 # Lesson 3: Extending Objects
 
 ### Demonstration: Refining Code for Maintainability and Extensibility