docs(client): fix incorrect comment about timeout calculation. No logic or functional changes.

Author: grayroom

src/openai/_base_client.py

@@ -703,7 +703,7 @@ def _calculate_retry_timeout(
         # Apply exponential backoff, but not more than the max.
         sleep_seconds = min(INITIAL_RETRY_DELAY * pow(2.0, nb_retries), MAX_RETRY_DELAY)
 
-        # Apply some jitter, plus-or-minus half a second.
+        # Apply some jitter, take up to at most 25 percent of the retry time.
         jitter = 1 - 0.25 * random()
         timeout = sleep_seconds * jitter
         return timeout if timeout >= 0 else 0