minor doc fixes

Author: jreback

doc/source/basics.rst

@@ -919,20 +919,20 @@ be the keys, the inner the name of the functions.
 
 .. ipython:: python
 
-   tsdf.A.agg({'foo' : ['sum', 'mean']})
+   tsdf.A.agg({'foo': ['sum', 'mean']})
 
 Alternatively, using multiple dictionaries, you can have renamed elements with the aggregation
 
 .. ipython:: python
 
-    tsdf.A.agg({'foo' : 'sum', 'bar': 'mean'})
+    tsdf.A.agg({'foo': 'sum', 'bar': 'mean'})
 
 Multiple keys will yield a MultiIndex Series. The outer level will be the keys, the inner
 the names of the functions.
 
 .. ipython:: python
 
-    tsdf.A.agg({'foo' : ['sum', 'mean'], 'bar': ['min', 'max', lambda x: x.sum()+1]})
+    tsdf.A.agg({'foo': ['sum', 'mean'], 'bar': ['min', 'max', lambda x: x.sum()+1]})
 
 .. _basics.aggregation.mixed_dtypes: