fix: Grammar correction

[xlvpod]

docs (application-architecture): change noun to plural

Change noun used on line 82 to the plural form. Change the "one" in the text, "but the most commonly used components are the one that" to "ones"

Closes #1909

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What is the current state of the documentation article?

#1909

What is the new state of the documentation article?

Changed the "one" in this statement "but the most commonly used components are the one that" to "ones"

Fixes/Implements/Closes #[1909].