DOC: Ambiguous description in to_parquet engine documentation 
Ambiguity correction in documentation on pandas.DataFrame.to_parquet

- [x] closes #19662
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] tests added / passed
- [x] whatsnew entry

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19669?src=pr&el=h1) Report
> Merging [#19669](https://codecov.io/gh/pandas-dev/pandas/pull/19669?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/d9551c8ee2a09ccc4c39d2b661f199334162edb6?src=pr&el=desc) will **increase** coverage by `0.03%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/19669/graphs/tree.svg?height=150&src=pr&token=eZ4WkYLtcO&width=650)](https://codecov.io/gh/pandas-dev/pandas/pull/19669?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #19669      +/-   ##
==========================================
+ Coverage   91.57%    91.6%   +0.03%     
==========================================
  Files         150      150              
  Lines       48817    48864      +47     
==========================================
+ Hits        44704    44764      +60     
+ Misses       4113     4100      -13
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.98% <ø> (+0.03%)` | :arrow_up: |
| #single | `41.75% <ø> (+0.02%)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/19669?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/parquet.py](https://codecov.io/gh/pandas-dev/pandas/pull/19669/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL3BhcnF1ZXQucHk=) | `71.79% <ø> (ø)` | :arrow_up: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/19669/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.16% <ø> (ø)` | :arrow_up: |
| [pandas/core/arrays/base.py](https://codecov.io/gh/pandas-dev/pandas/pull/19669/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYXJyYXlzL2Jhc2UucHk=) | `60% <0%> (-0.61%)` | :arrow_down: |
| [pandas/core/indexes/multi.py](https://codecov.io/gh/pandas-dev/pandas/pull/19669/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9tdWx0aS5weQ==) | `95.06% <0%> (-0.01%)` | :arrow_down: |
| [pandas/core/dtypes/concat.py](https://codecov.io/gh/pandas-dev/pandas/pull/19669/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZHR5cGVzL2NvbmNhdC5weQ==) | `99.14% <0%> (ø)` | :arrow_up: |
| [pandas/core/arrays/categorical.py](https://codecov.io/gh/pandas-dev/pandas/pull/19669/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYXJyYXlzL2NhdGVnb3JpY2FsLnB5) | `94.89% <0%> (+0.01%)` | :arrow_up: |
| [pandas/core/base.py](https://codecov.io/gh/pandas-dev/pandas/pull/19669/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvYmFzZS5weQ==) | `96.79% <0%> (+0.01%)` | :arrow_up: |
| [pandas/core/indexes/category.py](https://codecov.io/gh/pandas-dev/pandas/pull/19669/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9jYXRlZ29yeS5weQ==) | `97.27% <0%> (+0.01%)` | :arrow_up: |
| [pandas/core/indexes/base.py](https://codecov.io/gh/pandas-dev/pandas/pull/19669/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9iYXNlLnB5) | `96.46% <0%> (+0.02%)` | :arrow_up: |
| [pandas/core/indexes/interval.py](https://codecov.io/gh/pandas-dev/pandas/pull/19669/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9pbnRlcnZhbC5weQ==) | `92.44% <0%> (+0.04%)` | :arrow_up: |
| ... and [4 more](https://codecov.io/gh/pandas-dev/pandas/pull/19669/diff?src=pr&el=tree-more) | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19669?src=pr&el=continue).
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> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19669?src=pr&el=footer). Last update [d9551c8...8fac45b](https://codecov.io/gh/pandas-dev/pandas/pull/19669?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 Looks like some stray commits got into your PR. Do you need help cleaning up your branch? @TomAugspurger yes I need! I tried in several ways to clear the jump but I could not! can you help me? Ok, should be good now. I added a commit deleting your window-related changes.

In general, when you make a PR you want to

```
# fetch the latest changes from master
git fetch upstream

git checkout master
git pull

# Checkout a new branch for your changes
git checkout -b parquet-docs
```

And you do that for each PR independently.
 @TomAugspurger thanks for helping this newbie! @jorisvandenbossche I did the suggested fix, could you check it now? @gilbertoolimpio It seems you reverted the full explanation? My comment was only to keep the word "option", the rest of the modifications were certainly an improvement! @jorisvandenbossche Ops! now was better? =) Yes, that's better. Can you do the same for the other occurrences? @jorisvandenbossche newbie here! =) Thanks for your help! Now all updated.