Agressive Ratelimit

Please clarify the rate limits in the documentation.
The current version states 5 calls per minute, which conflicts with the actual configuration. Please update it to reflect the correct limits, if there have been any changes.

Aggressive 429s at present:

➜  gmail git:(master) ✗ python3 kustom_rl_test.py
Time is 20:11:15, Tuesday, 19-08-2025, that is in epoch 1755614475
200
x-ratelimit-reset: 1755614528
x-ratelimit-limit: 5
x-ratelimit-remaining: 2
➜  gmail git:(master) ✗ python3 kustom_rl_test.py
Time is 20:11:33, Tuesday, 19-08-2025, that is in epoch 1755614493
429
x-ratelimit-reset: None
x-ratelimit-limit: None
x-ratelimit-remaining: None
➜  gmail git:(master) ✗ python3 kustom_rl_test.py
Time is 20:11:53, Tuesday, 19-08-2025, that is in epoch 1755614513
429
x-ratelimit-reset: None
x-ratelimit-limit: None
x-ratelimit-remaining: None
➜  gmail git:(master) ✗ python3 kustom_rl_test.py
Time is 20:12:12, Tuesday, 19-08-2025, that is in epoch 1755614532
200
x-ratelimit-reset: 1755614588
x-ratelimit-limit: 5
x-ratelimit-remaining: 1
➜  gmail git:(master) ✗ python3 kustom_rl_test.py
Time is 20:12:38, Tuesday, 19-08-2025, that is in epoch 1755614558
429
x-ratelimit-reset: None
x-ratelimit-limit: None
x-ratelimit-remaining: None