DOC : Update the Period.second docstring
```
# Period.second
############################################################################
####################### Docstring (pandas.Period.second) #######################
################################################################################

Get second of the minute component of the Period.

Returns
-------
int 
    The second as an integer, between 0 and 59.

See Also
--------
Period.hour : Get the hour component of the Period.
Period.minute : Get the minute component of the Period.

Examples
--------
>>> p = pd.Period("2018-03-11 13:03:12.050000")
>>> p.second
12

################################################################################
################################## Validation ##################################
################################################################################
```
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/20319?src=pr&el=h1) Report
> Merging [#20319](https://codecov.io/gh/pandas-dev/pandas/pull/20319?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/31afaf858604ab85665b54b92f40cef19d69a28d?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/20319/graphs/tree.svg?width=650&src=pr&token=eZ4WkYLtcO&height=150)](https://codecov.io/gh/pandas-dev/pandas/pull/20319?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #20319   +/-   ##
=======================================
  Coverage   91.72%   91.72%           
=======================================
  Files         150      150           
  Lines       49165    49165           
=======================================
  Hits        45099    45099           
  Misses       4066     4066
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.11% <ø> (ø)` | :arrow_up: |
| #single | `41.86% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/20319?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/20319?src=pr&el=footer). Last update [31afaf8...2188f80](https://codecov.io/gh/pandas-dev/pandas/pull/20319?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 lgtm Thanks @WillAyd  Thanks! thanks