DOC: Removing remaining spellcheck related stuff (deps, docs, code, whatsnew)
In #24287 the sphinx spellcheck system has been removed. But some parts were forgot, and they are removed here.
Hello @datapythonista! Thanks for submitting the PR.

 - There are no PEP8 issues in the file [`doc/make.py`](https://github.com/datapythonista/pandas/blob/26a15af48495370d62be31f02fad16d4a05f9265/doc/make.py) !

 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24299?src=pr&el=h1) Report
> Merging [#24299](https://codecov.io/gh/pandas-dev/pandas/pull/24299?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/ca85a41242af245b32f6c62580b072d1685342d4?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/24299/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/24299?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #24299   +/-   ##
=======================================
  Coverage   92.28%   92.28%           
=======================================
  Files         162      162           
  Lines       51827    51827           
=======================================
  Hits        47827    47827           
  Misses       4000     4000
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.68% <ø> (ø)` | :arrow_up: |
| #single | `43.01% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24299?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/24299?src=pr&el=footer). Last update [ca85a41...26a15af](https://codecov.io/gh/pandas-dev/pandas/pull/24299?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24299?src=pr&el=h1) Report
> Merging [#24299](https://codecov.io/gh/pandas-dev/pandas/pull/24299?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/ca85a41242af245b32f6c62580b072d1685342d4?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/24299/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/24299?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #24299   +/-   ##
=======================================
  Coverage   92.28%   92.28%           
=======================================
  Files         162      162           
  Lines       51827    51827           
=======================================
  Hits        47827    47827           
  Misses       4000     4000
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.68% <ø> (ø)` | :arrow_up: |
| #single | `43.01% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/24299?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/24299?src=pr&el=footer). Last update [ca85a41...4d03f6a](https://codecov.io/gh/pandas-dev/pandas/pull/24299?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 Thnks!