adding error in path for test

Signed-off-by: Nate W <[email protected]>

Author: nate-double-u

content/en/abstraction.md

@@ -12,7 +12,7 @@ making a system more generic and thus easily understood.
 A good example is your laptop's operating system (OS). 
 It abstracts away all the details of how your computer works. 
 You don't need to know anything about CPU, memory, and how programs are handled, 
-you just operate the open-source and the OS deals with the details. 
+you just operate the open source and the OS deals with the details. 
 All these details are hidden behind the OS "curtain" or abstraction. 
 
 Systems typically have multiple abstraction layers.