Cleanup docstring types

[araffin]

Description

closes #10 (follow up of #167 )

I used some regex magic to do that ;) (see details in the issue).
I used some css to make the type prettier.
The result: https://stable-baselines3.readthedocs.io/en/doc-clean-types/modules/base.html

TODO:

• remove duplicate types
• Post-process the output of the sphinx autodoc extension (see discussion in Update docs (custom policy, type hints) #167 )

Motivation and Context

• I have raised an issue to propose this change (required for new features and bug fixes)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)

Checklist:

• I've read the CONTRIBUTION guide (required)
• I have updated the changelog accordingly (required).
• My change requires a change to the documentation.
• I have updated the tests accordingly (required for a bug fix or a new feature).
• I have updated the documentation accordingly.
• I have reformatted the code using make format (required)
• I have checked the codestyle using make check-codestyle and make lint (required)
• I have ensured make pytest and make type both pass. (required)

Note: we are using a maximum length of 127 characters per line

[araffin]

Please wait a tiny bit before merging... I'm experimenting a better way to solve the style issue

[araffin]

It is ready now ;) (I tested a js hack, that was kinda working but unsatisfying)
I also trying playing with sphinx extension but could not manage to change the formatting without breaking the build.

[Miffyli]

Skimmed through results and looks good to me, apart from one derp-looking docstring :)

[Miffyli]

Is this ready for checking/merging? Things look good but I wonder if there are still some docstrings missing :)

[araffin]

Is this ready for checking/merging? Things look good but I wonder if there are still some docstrings missing :)

ready for what it was meant for ;)

[araffin]

finishing to type everything is another issue

[Miffyli]

In that case LGTM! Will take an internal note on cleaning up any remaining types in doctstrings / adding missing ones :)