Missing brackets from example Python request code snippets

[dotpeedeeeff]

Existing code

`import requests
headers = {
'Accept': 'application/json'
}

r = requests.get('https://api.carbonintensity.org.uk/intensity', params={}, headers = headers)

print r.json()
`

The copied phone snippet from the docs did not work on python3.10, adding the brackets around r.json() got it working fine.

`import requests
headers = {
'Accept': 'application/json'
}

r = requests.get('https://api.carbonintensity.org.uk/intensity', params={}, headers = headers)

print(r.json())
`

[dotpeedeeeff]

I have fixed this and submitted a pull request.