Update model name in tool_use.mdx for Groq (#189)

Updated model from `llama-3.3-70b-versatile` to `llama-3.1-8b-instant`
as with `llama-3.3-70b-versatile` model the specific tool calling
example is not working consistently .

please refer to the issue 
agno-agi/agno#2601

### **Description**
The exact example given for Groq Agent with tools is not wroking
properly .
Getting some unexpected errors.

### **Steps to Reproduce**
Copy the example given on the following page
https://docs.agno.com/examples/models/groq/tool_use


```py
from agno.agent import Agent
from agno.models.groq import Groq
from agno.tools.duckduckgo import DuckDuckGoTools
from agno.tools.newspaper4k import Newspaper4kTools

agent = Agent(
    model=Groq(id="llama-3.3-70b-versatile"),
    tools=[DuckDuckGoTools(), Newspaper4kTools()],
    description="You are a senior NYT researcher writing an article on a topic.",
    instructions=[
        "For a given topic, search for the top 5 links.",
        "Then read each URL and extract the article text, if a URL isn't available, ignore it.",
        "Analyse and prepare an NYT worthy article based on the information.",
    ],
    markdown=True,
    show_tool_calls=True,
    add_datetime_to_instructions=True,
)
agent.print_response("Simulation theory", stream=True)


```

### **Expected Behavior**
Output should be an article on particluar topic.

### **Actual Behavior**

```py
groq.APIError: Failed to call a function. Please adjust your prompt. See 'failed_generation' for more details.

```

### **Screenshots or Logs **


![image](https://github.com/user-attachments/assets/0c0fa2e0-41ea-4630-bbb1-95dfb9300b79)

### **Environment**

```bash
OS: Linux 6.8.0-56-generic
Python Version: 3.12.3
groq==0.20.0
duckduckgo-search==7.5.5
newspaper4k==0.9.3.1
lxml-html-clean==0.4.1
agno==1.2.6

```

### **Solution**

With changed model the example works perfectly . Seems
`llama-3.3-70b-versatile` is unable to handle the tool calling for the
particlular example .
Refer     https://docs.agno.com/models/groq
Worked perfectly with 

```py

from agno.agent import Agent
from agno.models.groq import Groq
from agno.tools.duckduckgo import DuckDuckGoTools
from agno.tools.newspaper4k import Newspaper4kTools

agent = Agent(
    model=Groq(id="llama-3.1-8b-instant"),
    tools=[DuckDuckGoTools(), Newspaper4kTools()],
    description="You are a senior NYT researcher writing an article on a topic.",
    instructions=[
        "For a given topic, search for the top 5 links.",
        "Then read each URL and extract the article text, if a URL isn't available, ignore it.",
        "Analyse and prepare an NYT worthy article based on the information.",
    ],
    markdown=True,
    show_tool_calls=True,
    add_datetime_to_instructions=True,
)
agent.print_response("Simulation theory", stream=True)


```
### **Proof** 

![Screenshot from 2025-04-01
22-30-11](https://github.com/user-attachments/assets/581a26d1-5a0d-448d-9634-af99ff7d7f2d)

Co-authored-by: Yash Pratap Solanky <[email protected]>

Author: Ansumanbhujabal

examples/models/groq/tool_use.mdx

@@ -11,7 +11,7 @@ from agno.tools.duckduckgo import DuckDuckGoTools
 from agno.tools.newspaper4k import Newspaper4kTools
 
 agent = Agent(
-    model=Groq(id="llama-3.3-70b-versatile"),
+    model=Groq(id="llama-3.1-8b-instant"),
     tools=[DuckDuckGoTools(), Newspaper4kTools()],
     description="You are a senior NYT researcher writing an article on a topic.",
     instructions=[
@@ -54,4 +54,4 @@ agent.print_response("Simulation theory", stream=True)
     ```
     </CodeGroup>
   </Step>
-</Steps>
+</Steps>