BUG: add note to docstring about dtype keyword when creating Series from abother Series (#59300)

* BUG: add note on creating Series from Series with dtype keyword

When creating Series from another Series `dtype` keyword is ignored.
See GH #59060. Add note to the docstring to underline this behaviour to
Series and DataFrame constructors.

* make backticks double

Co-authored-by: Matthew Roeschke <[email protected]>

---------

Co-authored-by: Matthew Roeschke <[email protected]>

Author: taranarmo

pandas/core/frame.py

@@ -531,6 +531,7 @@ class DataFrame(NDFrame, OpsMixin):
         will perform column selection instead.
     dtype : dtype, default None
         Data type to force. Only a single dtype is allowed. If None, infer.
+        If ``data`` is DataFrame then is ignored.
     copy : bool or None, default None
         Copy data from inputs.
         For dict data, the default of None behaves like ``copy=True``.  For DataFrame

pandas/core/series.py

@@ -256,6 +256,7 @@ class Series(base.IndexOpsMixin, NDFrame):  # type: ignore[misc]
         Data type for the output Series. If not specified, this will be
         inferred from `data`.
         See the :ref:`user guide <basics.dtypes>` for more usages.
+        If ``data`` is Series then is ignored.
     name : Hashable, default None
         The name to give to the Series.
     copy : bool, default False