code-organization: Fix incomplete sentence under "Encapsulation"

Fixed "Encapsulation" section which had missing text.

The incomplete "is sufficient to lend" sentence has been here as early
as the first 2011 commit of the book that the site was based on:

https://github.com/rmurphey/jqfundamentals/blob/55eb9dd5d5779b884fdafbe6673b04a5d0c97733/book/part3-advanced-topics/ch10-code-organization.html

Closes #748.
Fixes #744.

Author: ramyashankaran

page/code-organization/concepts.md

@@ -20,7 +20,7 @@ The concept of loose coupling can be especially troublesome to developers making
 
 ## Encapsulation
 
-The first step to code organization is separating pieces of your application into distinct pieces; sometimes, even just this effort is sufficient to lend
+The first step to code organization is separating pieces of your application into distinct pieces; sometimes, even just this effort is sufficient to improve the structure of your code and its maintainability.
 
 ### The Object Literal