Remove redundant VAR=$VAR statements, add flags to use the rag pipeli…

…ne with OpenAI

examples/llm/rag/README.md

@@ -214,14 +214,14 @@ pipeline option of `rag`:
 
 ```bash
 export NGC_API_KEY=[YOUR_KEY_HERE]
-NGC_API_KEY=${NGC_API_KEY} python examples/llm/main.py rag pipeline
+python examples/llm/main.py rag pipeline
 ```
 
 **Using OpenAI LLM models**
 
 ```bash
 export OPENAI_API_KEY=[YOUR_KEY_HERE]
-OPENAI_API_KEY=${OPENAI_API_KEY} python examples/llm/main.py rag pipeline
+python examples/llm/main.py rag pipeline --llm_service=OpenAI --model_name=gpt-3.5-turbo
 ```
 
 ### Run example (Persistent Pipeline):
@@ -232,14 +232,14 @@ OPENAI_API_KEY=${OPENAI_API_KEY} python examples/llm/main.py rag pipeline
 
 ```bash
 export NGC_API_KEY=[YOUR_KEY_HERE]
-python examples/llm/main.py rag persistent 
+python examples/llm/main.py rag persistent
 ```
 
 **Using OpenAI LLM models**
 
 ```bash
 export OPENAI_API_KEY=[YOUR_KEY_HERE]
-python examples/llm/main.py rag persistent 
+python examples/llm/main.py rag persistent
 ```
 
 ### Options:
@@ -273,4 +273,3 @@ The `rag` command has its own set of options and commands:
 
 - `persistant`
 - `pipeline`
-