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

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

Author: taranarmo

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 dtype keyword is ignored.
     name : Hashable, default None
         The name to give to the Series.
     copy : bool, default False