Update playground.md

Corrected subject-verb agreement issue on line 43. Changed "define" to "defines".

Author: p-baldos

solutions/search/rag/playground.md

@@ -40,7 +40,7 @@ Here’s a simpified overview of how Playground works:
 
 * User **creates a connection** to LLM provider
 * User **selects a model** to use for generating responses
-* User **define the model’s behavior and tone** with initial instructions
+* User **defines the model’s behavior and tone** with initial instructions
 
     * **Example**: "*You are a friendly assistant for question-answering tasks. Keep responses as clear and concise as possible.*"