DOC: Update escapechar param description for read_csv
- [X] closes #23717
- [ ] tests added / passed
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Hello @mhlevgen! Thanks for submitting the PR.

 - There are no PEP8 issues in the file [`pandas/io/parsers.py`](https://github.com/mhlevgen/pandas/blob/41a7df667dc8213badc7238abc62c8965cb7f400/pandas/io/parsers.py) !

 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23770?src=pr&el=h1) Report
> Merging [#23770](https://codecov.io/gh/pandas-dev/pandas/pull/23770?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/91d1c50327c209e03ffc32c5fd64f9666de81e20?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/23770/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/23770?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #23770   +/-   ##
=======================================
  Coverage   92.24%   92.24%           
=======================================
  Files         161      161           
  Lines       51433    51433           
=======================================
  Hits        47446    47446           
  Misses       3987     3987
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.64% <ø> (ø)` | :arrow_up: |
| #single | `42.28% <ø> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/23770?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/parsers.py](https://codecov.io/gh/pandas-dev/pandas/pull/23770/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL3BhcnNlcnMucHk=) | `95.55% <ø> (ø)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23770?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/23770?src=pr&el=footer). Last update [91d1c50...41a7df6](https://codecov.io/gh/pandas-dev/pandas/pull/23770?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 what issue is this closing?  I have made a mistake with issue number. The write one is 23717

пн, 19 нояб. 2018 г. в 02:13, Jeff Reback <notifications@github.com>:

> what issue is this closing?
>
> —
> You are receiving this because you were mentioned.
> Reply to this email directly, view it on GitHub
> <https://github.com/pandas-dev/pandas/pull/23770#issuecomment-439734893>,
> or mute the thread
> <https://github.com/notifications/unsubscribe-auth/AmCb1XZOiSjkk0AYbeoIBjIWtnIb0qxvks5uwemsgaJpZM4YoHeR>
> .
>
 @mhlevgen thanks for the contribution. Besides the incorrection regarding the quoting, I don't think the description of the `escapechar` parameter is very clear. Do you think you can improve it in this same PR? @mhlevgen do you have time to fix the conflicts? Closing as stale