DOC: Improved the docstring of pandas.Series.dt.components
Checklist for the pandas documentation sprint (ignore this if you are doing
an unrelated PR):

- [X] PR title is "DOC: update the <your-function-or-method> docstring"
- [X] The validation script passes: `scripts/validate_docstrings.py <your-function-or-method>`
- [ ] The PEP8 style check passes: `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [X] The html version looks good: `python doc/make.py --single <your-function-or-method>`
- [X] It has been proofread on language by another sprint participant

Please include the output of the validation script below between the "```" ticks:

```
################################################################################
################### Docstring (pandas.Series.dt.components)  ###################
################################################################################

Return a Dataframe of the components of the Timedeltas.

Provides a dataframe with the components of each of the timedeltas with
the same length and index as the original Series, and columns:

(days, hours, minutes, seconds, milliseconds, microseconds, nanoseconds)

Returns
-------
a : pandas.DataFrame

Examples
--------
>>> s = pd.Series(pd.to_timedelta(np.arange(5), unit='s'))
>>> s
0   00:00:00
1   00:00:01
2   00:00:02
3   00:00:03
4   00:00:04
dtype: timedelta64[ns]
>>> s.dt.components
   days  hours  minutes  seconds  milliseconds  microseconds  nanoseconds
0     0      0        0        0             0             0            0
1     0      0        0        1             0             0            0
2     0      0        0        2             0             0            0
3     0      0        0        3             0             0            0
4     0      0        0        4             0             0            0

################################################################################
################################## Validation ##################################
################################################################################

Errors found:
        See Also section not found

```

If the validation script still gives errors, but you think there is a good reason
to deviate in this case (and there are certainly such cases), please state this
explicitly.

This commit fails PEP 8 due to lines of length 81 in example - I can split this over multiple rows, but I feel this obscures the example. I'm happy to change if you disagree.


Checklist for other PRs (remove this part if you are doing a PR for the pandas documentation sprint):

- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry
