fix: Maestro example

[Moti2002]

fix the maestro example.
instead of:
from ai21 import AI21Client

client = AI21Client()

run_result = client.beta.maestro.runs.create_and_poll(
input="Write a poem about the ocean",
requirements=[
{
"name": "length requirement",
"description": "The length of the poem should be less than 1000 characters",
},
{
"name": "rhyme requirement",
"description": "The poem should rhyme",
},
],
include=["requirements_result"]
)

use this example:
input="Tell me about AI21 Maestro",
requirements=[
{
"name": "length requirement",
"description": "The length of the response should be less than 2000 characters",
},
{
"name": "source requirement",
"description": (
"Should rely on information from these websites: "
"https://www.ai21.com/, https://www.ai21.com/maestro/, "
"https://docs.ai21.com/home"
),
},
],
include=["requirements_result"] # Include additional fields in the result
)

Output the result

print("\n=== AI21 MAESTRO INFO ===")
print(run_result.result)
print()