Fixup for 'Training An Agent' page

[chr0nikler]

Description

"Training An Agent" code does not match visual outputs. Short term solution is to change visualization code to match outputs. Long-term proposal to change page to be specifically about agent training and let users go to tutorial for black jack, or do away with page entirely. If keeping page, could turn into a 2-arm/n-arm e-greedy bandit.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• Documentation only change (no code changed)

Screenshots

Before	After

Checklist:

• I have run the pre-commit checks with pre-commit run --all-files (see CONTRIBUTING.md instructions to set it up)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[pseudo-rnd-thoughts]

Thanks for the PR, sorry for the late review.
Quick question, why is two of them moving average using "valid" and the final one using "same"?

[chr0nikler]

Yeah, that middle graph is affected by the start and end windows if they aren't full. Centering (by "same" which is what the python code in the BlackJack Tutorial does) produces this

For reference: "valid" removes boundary effects. "same" produces the output length equal to max of the bigger of the two arrays.

[pseudo-rnd-thoughts]

Ok, I think that makes sense