minor: fix llm expansion in docs (#847)

Updates the docs to fix the LLM acronym expansion.

Author: glenacota

docs/concepts/testset_generation.md

@@ -16,7 +16,7 @@ Ragas takes a novel approach to evaluation data generation. An ideal evaluation
 
 ### In-Depth Evolution
 
-Language Language Models (LLMs) possess the capability to transform simple questions into more complex ones effectively. To generate medium to hard samples from the provided documents, we employ the following methods:
+Large Language Models (LLMs) possess the capability to transform simple questions into more complex ones effectively. To generate medium to hard samples from the provided documents, we employ the following methods:
 
 - **Reasoning:** Rewrite the question in a way that enhances the need for reasoning to answer it effectively.