pandas.Series.eq docs page example doesn't feature eq
The current stable documentation page for eq doesn't actually feature eq in the example:

https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Series.eq.html

I presume the last execution in the example should be something like this, rather than the add example. 

```
>>> a.eq(b)
a     True
b    False
c    False
d    False
e    False
dtype: bool
```

