DOC: typo in merge.rst

Author: jreback

doc/source/categorical.rst

@@ -617,6 +617,7 @@ Assigning a `Categorical` to parts of a column of other types will use the value
  df
  df.dtypes
 
+.. _categorical.merge:
 
 Merging
 ~~~~~~~

doc/source/merging.rst

@@ -779,7 +779,7 @@ resulting dtype will be upcast.
 
 .. versionadded:: 0.20.0
 
-Merging will preserve ``category`` dtypes of the mergands.
+Merging will preserve ``category`` dtypes of the mergands. See also the section on :ref:`categoricals <categorical.merge>`
 
 The left frame.
 
@@ -788,17 +788,17 @@ The left frame.
  X = pd.Series(np.random.choice(['foo', 'bar'], size=(10,)))
  X = X.astype('category', categories=['foo', 'bar'])
 
- left = DataFrame({'X': X,
- 'Y': np.random.choice(['one', 'two', 'three'], size=(10,))})
+ left = pd.DataFrame({'X': X,
+  'Y': np.random.choice(['one', 'two', 'three'], size=(10,))})
  left
  left.dtypes
 
 The right frame.
 
 .. ipython:: python
 
- right = DataFrame({'X': Series(['foo', 'bar']).astype('category', categories=['foo', 'bar']),
- 'Z': [1, 2]})
+ right = pd.DataFrame({'X': Series(['foo', 'bar']).astype('category', categories=['foo', 'bar']),
+  'Z': [1, 2]})
  right
  right.dtypes