[docs] update langsmith.mdx (#1306)

docs/integration/langsmith.mdx

@@ -13,7 +13,7 @@ To use langsmith, you need to do the following steps
 
 Lets cover each step in detail.
 
-* First make sure that you a LangSmith account created and have all the necessary variables handy. LangSmith has a [good documentation](https://docs.smith.langchain.com/) on how to get started with their service.
+* First make sure that you have created a LangSmith account and have all the necessary variables handy. LangSmith has a [good documentation](https://docs.smith.langchain.com/) on how to get started with their service.
 
 * Once you have the account setup, we will need the following environment variables