docs: Fixed Grammar & Improve reading (#27672)

Updated the documentation to fix some grammar errors

    - **Description:** Some language errors exist in the documentation
    - **Issue:** the issue # Changed the structure of some sentences

docs/docs/tutorials/index.mdx

@@ -4,7 +4,7 @@ sidebar_class_name: hidden
 ---
 # Tutorials
 
-New to LangChain or to LLM app development in general? Read this material to quickly get up and running.
+New to LangChain or LLM app development in general? Read this material to quickly get up and running.
 
 ## Basics
 - [Build a Simple LLM Application with LCEL](/docs/tutorials/llm_chain)
@@ -45,7 +45,7 @@ You can peruse [LangSmith tutorials here](https://docs.smith.langchain.com/tutor
 
 ### Evaluation
 
-LangSmith helps you evaluate the performance of your LLM applications. The below tutorial is a great way to get started:
+LangSmith helps you evaluate the performance of your LLM applications. The tutorial below is a great way to get started:
 
 - [Evaluate your LLM application](https://docs.smith.langchain.com/tutorials/Developers/evaluation)