Removed to_panel references (#26308)

Author: WillAyd

doc/source/reference/frame.rst

@@ -243,7 +243,6 @@ Reshaping, sorting, transposing
    DataFrame.swapaxes
    DataFrame.melt
    DataFrame.squeeze
-   DataFrame.to_panel
    DataFrame.to_xarray
    DataFrame.T
    DataFrame.transpose

pandas/core/generic.py

@@ -206,7 +206,7 @@ def _constructor_sliced(self):
     @property
     def _constructor_expanddim(self):
         """Used when a manipulation result has one higher dimension as the
-        original, such as Series.to_frame() and DataFrame.to_panel()
+        original, such as Series.to_frame()
         """
         raise NotImplementedError
 

pandas/core/reshape/concat.py

@@ -34,7 +34,7 @@ def concat(objs, axis=0, join='outer', join_axes=None, ignore_index=False,
 
     Parameters
     ----------
-    objs : a sequence or mapping of Series or DataFrame objects.
+    objs : a sequence or mapping of Series or DataFrame objects
         If a dict is passed, the sorted keys will be used as the `keys`
         argument, unless it is passed, in which case the values will be
         selected (see below). Any None objects will be dropped silently unless