DOC: timedelta return type (#44592)

* DOC: change return type #42316

* DOC: updating docstring

* Doc changing the Returns docstring to adhere to to_datetime structure

* DOC: combining types

Author: loicdiridollou

pandas/core/tools/timedeltas.py

@@ -68,8 +68,13 @@ def to_timedelta(arg, unit=None, errors="raise"):
 
     Returns
     -------
-    timedelta64 or numpy.array of timedelta64
-        Output type returned if parsing succeeded.
+    timedelta
+        If parsing succeeded.
+        Return type depends on input:
+
+        - list-like: TimedeltaIndex of timedelta64 dtype
+        - Series: Series of timedelta64 dtype
+        - scalar: Timedelta
 
     See Also
     --------