DOC: Updated the docstring of pandas.Series.str.get
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>`
- [x] 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.str.get)  ######################
################################################################################

Extract the element from each component at the specified position.

Extract element from lists, tuples, or strings in each element in the
Series/Index.

Parameters
----------
i : int
    Position of the element to extract.

Returns
-------
items : Series/Index of objects

Examples
--------
>>> s = pd.Series(["String", (1, 2, 3), ["a", "b", "c"], 123])
>>> s
0       String
1    (1, 2, 3)
2    [a, b, c]
3          123
dtype: object

>>> s.str.get(1)
0      t
1      2
2      b
3    NaN
dtype: object

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

Errors found:
	See Also section not found

```
Hello @datapythonista! I see that you've fixed the bug (which I tried fixing, but your solution is a lot better). Should I proceed writing the docstring with a dictionary & a negative value? You can add it, yes. My changes are not merged, so when you run the validation script you'll get the doctest fail, but no problem with that, when the bug is fixed your doctest will pass and your PR could be merged. Hello @pranavsuri! Thanks for updating the PR.



Cheers ! There are no PEP8 issues in this Pull Request. :beers: 

##### Comment last updated on April 24, 2018 at 09:56 Hours UTC # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/20667?src=pr&el=h1) Report
> Merging [#20667](https://codecov.io/gh/pandas-dev/pandas/pull/20667?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/2794474334cbd53315c248b605953579d010c693?src=pr&el=desc) will **increase** coverage by `0.02%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/20667/graphs/tree.svg?src=pr&token=eZ4WkYLtcO&width=650&height=150)](https://codecov.io/gh/pandas-dev/pandas/pull/20667?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #20667      +/-   ##
==========================================
+ Coverage   91.81%   91.83%   +0.02%     
==========================================
  Files         153      153              
  Lines       49270    49318      +48     
==========================================
+ Hits        45238    45293      +55     
+ Misses       4032     4025       -7
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.23% <ø> (+0.02%)` | :arrow_up: |
| #single | `41.87% <ø> (-0.03%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/20667?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/strings.py](https://codecov.io/gh/pandas-dev/pandas/pull/20667/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvc3RyaW5ncy5weQ==) | `98.32% <ø> (ø)` | :arrow_up: |
| [pandas/core/nanops.py](https://codecov.io/gh/pandas-dev/pandas/pull/20667/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvbmFub3BzLnB5) | `95.13% <0%> (-1.17%)` | :arrow_down: |
| [pandas/core/arrays/categorical.py](https://codecov.io/gh/pandas-dev/pandas/pull/20667/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYXJyYXlzL2NhdGVnb3JpY2FsLnB5) | `95.78% <0%> (-0.41%)` | :arrow_down: |
| [pandas/core/indexes/base.py](https://codecov.io/gh/pandas-dev/pandas/pull/20667/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9iYXNlLnB5) | `96.63% <0%> (-0.05%)` | :arrow_down: |
| [pandas/io/pytables.py](https://codecov.io/gh/pandas-dev/pandas/pull/20667/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL3B5dGFibGVzLnB5) | `92.41% <0%> (-0.05%)` | :arrow_down: |
| [pandas/tseries/offsets.py](https://codecov.io/gh/pandas-dev/pandas/pull/20667/diff?src=pr&el=tree#diff-cGFuZGFzL3RzZXJpZXMvb2Zmc2V0cy5weQ==) | `97% <0%> (-0.01%)` | :arrow_down: |
| [pandas/core/indexes/datetimelike.py](https://codecov.io/gh/pandas-dev/pandas/pull/20667/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9kYXRldGltZWxpa2UucHk=) | `96.72% <0%> (ø)` | :arrow_up: |
| [pandas/core/resample.py](https://codecov.io/gh/pandas-dev/pandas/pull/20667/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvcmVzYW1wbGUucHk=) | `96.43% <0%> (ø)` | :arrow_up: |
| [pandas/core/base.py](https://codecov.io/gh/pandas-dev/pandas/pull/20667/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYmFzZS5weQ==) | `96.79% <0%> (ø)` | :arrow_up: |
| [pandas/core/arrays/base.py](https://codecov.io/gh/pandas-dev/pandas/pull/20667/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYXJyYXlzL2Jhc2UucHk=) | `84.14% <0%> (ø)` | :arrow_up: |
| ... and [13 more](https://codecov.io/gh/pandas-dev/pandas/pull/20667/diff?src=pr&el=tree-more) | |

------

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> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/20667?src=pr&el=footer). Last update [2794474...26fdb84](https://codecov.io/gh/pandas-dev/pandas/pull/20667?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 @pranavsuri, Can you fix the PEP-8 issues? Besides that lgtm. But it needs to wait until #20671 is merged. thanks @pranavsuri 