docs: about of time -> amount of time (googleapis#9052)

typo fix

api_core/google/api_core/retry.py

@@ -125,9 +125,9 @@ def exponential_sleep_generator(initial, maximum, multiplier=_DEFAULT_DELAY_MULT
         https://cloud.google.com/storage/docs/exponential-backoff
 
     Args:
-        initial (float): The minimum about of time to delay. This must
+        initial (float): The minimum amout of time to delay. This must
             be greater than 0.
-        maximum (float): The maximum about of time to delay.
+        maximum (float): The maximum amout of time to delay.
         multiplier (float): The multiplier applied to the delay.
 
     Yields:
@@ -223,9 +223,9 @@ class Retry(object):
     Args:
         predicate (Callable[Exception]): A callable that should return ``True``
             if the given exception is retryable.
-        initial (float): The minimum about of time to delay in seconds. This
+        initial (float): The minimum a,out of time to delay in seconds. This
             must be greater than 0.
-        maximum (float): The maximum about of time to delay in seconds.
+        maximum (float): The maximum amout of time to delay in seconds.
         multiplier (float): The multiplier applied to the delay.
         deadline (float): How long to keep retrying in seconds.
     """
@@ -314,9 +314,9 @@ def with_delay(self, initial=None, maximum=None, multiplier=None):
         """Return a copy of this retry with the given delay options.
 
         Args:
-            initial (float): The minimum about of time to delay. This must
+            initial (float): The minimum amout of time to delay. This must
                 be greater than 0.
-            maximum (float): The maximum about of time to delay.
+            maximum (float): The maximum amout of time to delay.
             multiplier (float): The multiplier applied to the delay.
 
         Returns: