DOC: misc typos (pandas-dev#20029)

Author: luzpaz

doc/source/categorical.rst

@@ -177,7 +177,7 @@ are consistent among all columns.
 .. note::
 
     To perform table-wise conversion, where all labels in the entire ``DataFrame`` are used as
-    categories for each column, the ``categories`` parameter can be determined programatically by
+    categories for each column, the ``categories`` parameter can be determined programmatically by
     ``categories = pd.unique(df.values.ravel())``.
 
 If you already have ``codes`` and ``categories``, you can use the 

pandas/core/groupby.py

@@ -4842,7 +4842,7 @@ def _apply_to_column_groupbys(self, func):
             keys=self._selected_obj.columns, axis=1)
 
     def _fill(self, direction, limit=None):
-        """Overriden method to join grouped columns in output"""
+        """Overridden method to join grouped columns in output"""
         res = super(DataFrameGroupBy, self)._fill(direction, limit=limit)
         output = collections.OrderedDict(
             (grp.name, grp.grouper) for grp in self.grouper.groupings)

pandas/tests/io/test_excel.py

@@ -1014,7 +1014,7 @@ class _WriterBase(SharedItems):
     def set_engine_and_path(self, request, merge_cells, engine, ext):
         """Fixture to set engine and open file for use in each test case
 
-        Rather than requiring `engine=...` to be provided explictly as an
+        Rather than requiring `engine=...` to be provided explicitly as an
         argument in each test, this fixture sets a global option to dictate
         which engine should be used to write Excel files. After executing
         the test it rolls back said change to the global option.