Fix missing article in state-a-components-memory.md

Added missing "a" for grammatical correctness.

Author: BatetDev

src/content/learn/state-a-components-memory.md

@@ -520,7 +520,7 @@ button {
 
 </Sandpack>
 
-It is a good idea to have multiple state variables if their state is unrelated, like `index` and `showMore` in this example. But if you find that you often change two state variables together, it might be easier to combine them into one. For example, if you have a form with many fields, it's more convenient to have a single state variable that holds an object than state variable per field. Read [Choosing the State Structure](/learn/choosing-the-state-structure) for more tips.
+It is a good idea to have multiple state variables if their state is unrelated, like `index` and `showMore` in this example. But if you find that you often change two state variables together, it might be easier to combine them into one. For example, if you have a form with many fields, it's more convenient to have a single state variable that holds an object than a state variable per field. Read [Choosing the State Structure](/learn/choosing-the-state-structure) for more tips.
 
 <DeepDive>