docs: unify the name before sleep strategy in docstring and comments

tenacity/__init__.py

@@ -76,7 +76,7 @@
 from .after import after_log  # noqa
 from .after import after_nothing  # noqa
 
-# Import all built-in after strategies for easier usage.
+# Import all built-in before sleep strategies for easier usage.
 from .before_sleep import before_sleep_log  # noqa
 from .before_sleep import before_sleep_nothing  # noqa
 

tenacity/before_sleep.py

@@ -25,15 +25,15 @@
 
 
 def before_sleep_nothing(retry_state: "RetryCallState") -> None:
-    """Before call strategy that does nothing."""
+    """Before sleep strategy that does nothing."""
 
 
 def before_sleep_log(
     logger: "logging.Logger",
     log_level: int,
     exc_info: bool = False,
 ) -> typing.Callable[["RetryCallState"], None]:
-    """Before call strategy that logs to some logger the attempt."""
+    """Before sleep strategy that logs to some logger the attempt."""
 
     def log_it(retry_state: "RetryCallState") -> None:
         local_exc_info: BaseException | bool | None