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 element for each component.

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

Parameters
----------
i : int
    Integer index (location).

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

Examples
--------
>>> x = pd.Series(["String", (1, 2, 4), ["a", "b", "c"]])
>>> x
0       String
1    (1, 2, 4)
2    [a, b, c]
dtype: object

>>> x.str.get(1)
0      t
1      2
2      b
dtype: object

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

Errors found:
	See Also section not found
```
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/20630?src=pr&el=h1) Report
> Merging [#20630](https://codecov.io/gh/pandas-dev/pandas/pull/20630?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/6d610a4d9393c0d0335267dc3252ccabb9e51e43?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/20630/graphs/tree.svg?width=650&height=150&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/20630?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #20630      +/-   ##
==========================================
+ Coverage   91.82%   91.84%   +0.02%     
==========================================
  Files         153      153              
  Lines       49256    49256              
==========================================
+ Hits        45227    45241      +14     
+ Misses       4029     4015      -14
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.23% <ø> (+0.02%)` | :arrow_up: |
| #single | `41.9% <ø> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/20630?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/strings.py](https://codecov.io/gh/pandas-dev/pandas/pull/20630/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvc3RyaW5ncy5weQ==) | `98.32% <ø> (ø)` | :arrow_up: |
| [pandas/util/testing.py](https://codecov.io/gh/pandas-dev/pandas/pull/20630/diff?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvdGVzdGluZy5weQ==) | `84.73% <0%> (+0.2%)` | :arrow_up: |
| [pandas/plotting/\_converter.py](https://codecov.io/gh/pandas-dev/pandas/pull/20630/diff?src=pr&el=tree#diff-cGFuZGFzL3Bsb3R0aW5nL19jb252ZXJ0ZXIucHk=) | `66.81% <0%> (+1.73%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/20630?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/20630?src=pr&el=footer). Last update [6d610a4...ed71d52](https://codecov.io/gh/pandas-dev/pandas/pull/20630?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 Hello! I accidentally deleted the original fork from which I had created this pull-request. I've generated a new request at – https://github.com/pandas-dev/pandas/pull/20667 with the mentioned changes. I'm sorry for the trouble.