DOC: Fix capitalization among headings in documentation files (#32550)
Following #32978 and #32944.

Headers updated for the following files:
```
- [ ] doc/source/getting_started/comparison/comparison_with_stata.rst
- [ ] doc/source/getting_started/intro_tutorials/01_table_oriented.rst
- [ ] doc/source/getting_started/tutorials.rst
- [ ] doc/source/reference/arrays.rst
- [ ] doc/source/reference/window.rst
- [ ] doc/source/user_guide/boolean.rst
```
Can you please merge master? HI @MomIsBestFriend , sorry I am quite new to git. Could you please expand on what I should do? > HI @MomIsBestFriend , sorry I am quite new to git. Could you please expand on what I should do?

@themien Sure!

If your working environment is set up with the instructions found in the [contributing guide](https://dev.pandas.io/docs/development/contributing.html), you can merge "master" by running:

```
git checkout bug_32550_part_3
git fetch upstream
git merge upstream/master
```

And then, push your code again:

```
git push origin bug_32550_part_3
```
 @MomIsBestFriend great! Thank you looks ok. @datapythonista @jorisvandenbossche  Thanks @themien, nice clean up