DOC: Clean up docs for io.data.Options.
Per conversation on #5602, adjusted some of the docs.
Removed from release.rst, changed example strike price for AAPL, fixed backticks.

@jorisvandenbossche 
@jreback 
 @jorisvandenbossche wondering if should somehow limit the columns so the display is not so wide...

?
 We could do that - maybe cut it off at volume so it doesn't wrap? 

The downside being that you wouldn't see all the available information that is downloaded - ie: open int, underlying price, quote time, etc.  We could add that detail in the text.
 the doc-string is pretty comprehensive, this is just an example
 Good point.  Changed it to show only to volume.
 @jreback we could set `pd.options.display.max_columns` to a lower number, but otherwise, for the docs maybe better the user sees the same thing when they try it out themselves.
 no that's ok, only thing may want to revist the screen width in general in the docs? shouldn't it be larger?
 We have had that discussion before #4165, I think in the first place we should make our examples so that the output is not too wide.
 @dstephens99 There is now an indexing error: http://pandas-docs.github.io/pandas-docs-travis/remote_data.html#yahoo-finance-options
