Doc: Adds example of exploding lists into columns instead of storing in dataframe cells 
- [x] closes #17027

This is the continuation of PR #19215

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> Merging [#23041](https://codecov.io/gh/pandas-dev/pandas/pull/23041?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/ce1f81f8bcf038072e0ecb661310984076c4e7de?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

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```diff
@@           Coverage Diff           @@
##           master   #23041   +/-   ##
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  Coverage   92.19%   92.19%           
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  Files         169      169           
  Lines       50873    50873           
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  Hits        46904    46904           
  Misses       3969     3969
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.61% <ø> (ø)` | :arrow_up: |
| #single | `42.32% <ø> (ø)` | :arrow_up: |


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 What I use to expand a `Series` with lists in the values to the corresponding `DataFrame` is:
```python
import pandas

genres = pandas.Series([['drama', 'romance'], ['romance'], ['comedy', 'action']])
genres.str.join(',').str.get_dummies(',')
```

So, I think the content of this PR shouldn't be in the documentation (I know you just used the existing PR @mgautam98, sorry I didn't see that earlier).

May be a short entry with that to the cookbook could be useful.

Closing, if anybody disagrees, please reopen.