DOC: Small docstring clarifications (#48932)

Author: bashtage

pandas/core/indexes/datetimes.py

@@ -1170,8 +1170,9 @@ def bdate_range(
  Right bound for generating dates.
  periods : int, default None
  Number of periods to generate.
- freq : str, datetime.timedelta, or DateOffset, default 'B' (business daily)
- Frequency strings can have multiples, e.g. '5H'.
+ freq : str, Timedelta, datetime.timedelta, or DateOffset, default 'B'
+ Frequency strings can have multiples, e.g. '5H'. The default is
+ business daily ('B').
  tz : str or None
  Time zone name for returning localized DatetimeIndex, for example
  Asia/Beijing.

pandas/core/tools/datetimes.py

@@ -815,8 +815,10 @@ def to_datetime(
  - If :const:`'julian'`, unit must be :const:`'D'`, and origin is set to
  beginning of Julian Calendar. Julian day number :const:`0` is assigned
  to the day starting at noon on January 1, 4713 BC.
- - If Timestamp convertible, origin is set to Timestamp identified by
- origin.
+ - If Timestamp convertible (Timestamp, dt.datetime, np.datetimt64 or date
+ string), origin is set to Timestamp identified by origin.
+ - If a float or integer, origin is the mullisecond difference
+ relative to 1970-01-01.
  cache : bool, default True
  If :const:`True`, use a cache of unique, converted dates to apply the
  datetime conversion. May produce significant speed-up when parsing