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docs: improve rag doc (#1411)

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# What does this PR do?
[Provide a short summary of what this PR does and why. Link to relevant
issues if applicable.]

[//]: # (If resolving an issue, uncomment and update the line below)
[//]: # (Closes #[issue-number])

## Test Plan
[Describe the tests you ran to verify your changes with result
summaries. *Provide clear instructions so the plan can be easily
re-executed.*]

[//]: # (## Documentation)

Signed-off-by: reidliu <reid201711@gmail.com>
Co-authored-by: reidliu <reid201711@gmail.com>
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docs/source/building_applications/rag.md
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@ -20,6 +20,11 @@ We may add more storage types like Graph IO in the future.
Here's how to set up a vector database for RAG:
```python
# Create http client
from llama_stack_client import LlamaStackClient
client = LlamaStackClient(base_url=f"http://localhost:{os.environ['LLAMA_STACK_PORT']}")
# Register a vector db
vector_db_id = "my_documents"
response = client.vector_dbs.register(
@ -136,6 +141,14 @@ response = agent.create_turn(
)
```
You can print the response with below.
```python
from llama_stack_client.lib.agents.event_logger import EventLogger
for log in EventLogger().log(response):
log.print()
```
### Unregistering Vector DBs
If you need to clean up and unregister vector databases, you can do so as follows: