Fix typo (#2942)

Author: mnahinkhan

Diff for: docs/modules/memory/examples/agent_with_memory_in_db.ipynb

@@ -16,7 +16,7 @@
     "In order to add a memory with an external message store to an agent we are going to do the following steps:\n",
     "\n",
     "1. We are going to create a `RedisChatMessageHistory` to connect to an external database to store the messages in.\n",
-    "2. We are going to create an `LLMChain` useing that chat history as memory.\n",
+    "2. We are going to create an `LLMChain` using that chat history as memory.\n",
     "3. We are going to use that `LLMChain` to create a custom Agent.\n",
     "\n",
     "For the purposes of this exercise, we are going to create a simple custom Agent that has access to a search tool and utilizes the `ConversationBufferMemory` class."