DOC: Refactor Intro to Data Structures (pandas-dev#46316)

Author: mroeschke

doc/source/reference/index.rst

@@ -47,20 +47,11 @@ public functions related to data types in pandas.
 ..
     .. toctree::
 
-        api/pandas.DataFrame.blocks
-        api/pandas.DataFrame.as_matrix
         api/pandas.Index.asi8
-        api/pandas.Index.data
-        api/pandas.Index.flags
         api/pandas.Index.holds_integer
         api/pandas.Index.is_type_compatible
         api/pandas.Index.nlevels
         api/pandas.Index.sort
-        api/pandas.Series.asobject
-        api/pandas.Series.blocks
-        api/pandas.Series.from_array
-        api/pandas.Series.imag
-        api/pandas.Series.real
 
 
 .. Can't convince sphinx to generate toctree for this class attribute.