docs: Update ollama examples with new community libraries (#17007)

- **Description:** Updating one line code sample for Ollama with new
**langchain_community** package
  - **Issue:**
  - **Dependencies:** none
  - **Twitter handle:**  @picsoung

docs/docs/integrations/providers/ollama.mdx

@@ -21,7 +21,7 @@ To use, you should set up the environment variables `ANYSCALE_API_BASE` and
 ## LLM
 
 ```python
-from langchain.llms import Ollama
+from langchain_community.llms import Ollama
 ```
 
 See the notebook example [here](/docs/integrations/llms/ollama).
@@ -31,7 +31,7 @@ See the notebook example [here](/docs/integrations/llms/ollama).
 ### Chat Ollama
 
 ```python
-from langchain.chat_models import ChatOllama
+from langchain_community.chat_models import ChatOllama
 ```
 
 See the notebook example [here](/docs/integrations/chat/ollama).
@@ -47,7 +47,7 @@ See the notebook example [here](/docs/integrations/chat/ollama_functions).
 ## Embedding models
 
 ```python
-from langchain.embeddings import OllamaEmbeddings
+from langchain_community.embeddings import OllamaEmbeddings
 ```
 
 See the notebook example [here](/docs/integrations/text_embedding/ollama).