DOC: 9789 Added missing letter, fixed link and Examples formatting.
Fix for https://github.com/pydata/pandas/issues/9789. 

How do you feel about direct URLs in the doctrings?
I saw them in a few other docstrings. Pandas maintainers, any preferences?
Still need to fix the Examples at the bottom of the page.

lgtm. is there a standard to putting links in doc-strings so that they render when viewed in html (and text otherwise)? @jorisvandenbossche 
 @jorisvandenbossche @jreback 
I found some examples in the pandas API docs where links are rendered with nicer markup and the format seems to be  ``Link text <URL>`_`. This also follows the [Sphinx documentation style guide for links and references](http://documentation-style-guide-sphinx.readthedocs.org/en/latest/style-guide.html#links-and-references)so unless you have any objections, I'll change the markup in my pull to reflect the Sphinx recommendations.
 Hope the squashing worked.
 About the url. In principle this can even be made shorter by using the internal links. Here, this would be something like:

```
:ref:`here <timeseries>`
```

The disadvantage of this is that when looking at the docstring in text format (in completion box eg) and not online, you don't see a url you can copy paste. 
So I think in this case your approach is a good compromise: use the full url (for when looking in text format), but with a shorter version in the html docs.
 thanks!
