Update recording slicing docstrings describing default behavior

Author: kushaangupta

src/spikeinterface/core/baserecording.py

@@ -749,9 +749,9 @@ def frame_slice(self, start_frame: int | None, end_frame: int | None) -> BaseRec
         Parameters
         ----------
         start_frame : int, optional
-            The start frame, if not provided it is set to 0
+            Start frame index. If None, defaults to the beginning of the recording (frame 0).
         end_frame : int, optional
-            The end frame, it not provided it is set to the total number of samples
+            End frame index. If None, defaults to the last frame of the recording.
 
         Returns
         -------
@@ -771,9 +771,9 @@ def time_slice(self, start_time: float | None, end_time: float | None) -> BaseRe
         Parameters
         ----------
         start_time : float, optional
-            The start time in seconds. If not provided it is set to 0.
+            Start time in seconds. If None, defaults to the beginning of the recording.
         end_time : float, optional
-            The end time in seconds. If not provided it is set to the total duration.
+            End time in seconds. If None, defaults to the end of the recording.
 
         Returns
         -------