Fixed typo in get_started.mdx (#10163)

Fix typo: 'Whats up' -> 'What's up'

Thanks
CC: @baskaryan, @eyurtsev, @rlancemartin.

---------

Co-authored-by: Aashish Saini <141953346+AashishSainiShorthillsAI@users.noreply.github.com>
Co-authored-by: AryamanJaiswalShorthillsAI <142397527+AryamanJaiswalShorthillsAI@users.noreply.github.com>
Co-authored-by: Adarsh Shrivastav <142413097+AdarshKumarShorthillsAI@users.noreply.github.com>
Co-authored-by: Vishal <141389263+VishalYadavShorthillsAI@users.noreply.github.com>
Co-authored-by: ChetnaGuptaShorthillsAI <142381084+ChetnaGuptaShorthillsAI@users.noreply.github.com>
Co-authored-by: PankajKumarShorthillsAI <142473460+PankajKumarShorthillsAI@users.noreply.github.com>
Co-authored-by: AbhishekYadavShorthillsAI <142393903+AbhishekYadavShorthillsAI@users.noreply.github.com>
Co-authored-by: AmitSinghShorthillsAI <142410046+AmitSinghShorthillsAI@users.noreply.github.com>
Co-authored-by: Aayush <142384656+AayushShorthillsAI@users.noreply.github.com>

docs/snippets/modules/memory/get_started.mdx

@@ -7,7 +7,7 @@ from langchain.memory import ConversationBufferMemory
 
 memory = ConversationBufferMemory()
 memory.chat_memory.add_user_message("hi!")
-memory.chat_memory.add_ai_message("whats up?")
+memory.chat_memory.add_ai_message("what's up?")
 ```
 
 When using memory in a chain, there are a few key concepts to understand.
@@ -28,7 +28,7 @@ memory.load_memory_variables({})
 <CodeOutputBlock lang="python">
 
 ```
-    {'history': "Human: hi!\nAI: whats up?"}
+    {'history': "Human: hi!\nAI: what's up?"}
 ```
 
 </CodeOutputBlock>
@@ -41,12 +41,12 @@ For example, if you want the memory variables to be returned in the key `chat_hi
 ```python
 memory = ConversationBufferMemory(memory_key="chat_history")
 memory.chat_memory.add_user_message("hi!")
-memory.chat_memory.add_ai_message("whats up?")
+memory.chat_memory.add_ai_message("what's up?")
 ```
 <CodeOutputBlock lang="python">
 
 ```
-    {'chat_history': "Human: hi!\nAI: whats up?"}
+    {'chat_history': "Human: hi!\nAI: what's up?"}
 ```
 
 </CodeOutputBlock>
@@ -65,13 +65,13 @@ In order to return as a list of messages, you can set `return_messages=True`
 ```python
 memory = ConversationBufferMemory(return_messages=True)
 memory.chat_memory.add_user_message("hi!")
-memory.chat_memory.add_ai_message("whats up?")
+memory.chat_memory.add_ai_message("what's up?")
 ```
 <CodeOutputBlock lang="python">
 
 ```
     {'history': [HumanMessage(content='hi!', additional_kwargs={}, example=False),
-  AIMessage(content='whats up?', additional_kwargs={}, example=False)]}
+  AIMessage(content='what's up?', additional_kwargs={}, example=False)]}
 ```
 
 </CodeOutputBlock>