DOC: Updating str_repeat docstring
Hello @JesperDramsch! Thanks for updating the PR.



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

##### Comment last updated on September 02, 2018 at 09:54 Hours UTC ## hahahah https://travis-ci.org/pandas-dev/pandas/jobs/423383576#L3419

@JesperDramsch : Looks like you have a linting failure here. # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/22571?src=pr&el=h1) Report
> Merging [#22571](https://codecov.io/gh/pandas-dev/pandas/pull/22571?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/98fb53ca2d64658749e9f182b391002ef3500c1b?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/22571/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/22571?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #22571   +/-   ##
=======================================
  Coverage   92.04%   92.04%           
=======================================
  Files         169      169           
  Lines       50787    50787           
=======================================
  Hits        46745    46745           
  Misses       4042     4042
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.45% <ø> (ø)` | :arrow_up: |
| #single | `42.29% <ø> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/22571?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/strings.py](https://codecov.io/gh/pandas-dev/pandas/pull/22571/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvc3RyaW5ncy5weQ==) | `98.63% <ø> (ø)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/22571?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/22571?src=pr&el=footer). Last update [98fb53c...a252aa7](https://codecov.io/gh/pandas-dev/pandas/pull/22571?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 @JesperDramsch : I like the change!  FYI, Anaconda is having some serious servicing issues, so our CI is not going to work at all for the time being. Alright then I'll chill out and enjoy the view. @datapythonista  Finally merging this. We can add improvements from #20634 later on in a new PR. Thanks @JesperDramsch 