update map section of RL Vol2 rl

[rasoolfa]

Description of changes:

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[AnirudhDagar]

I think there are still some conflicting files. @rasoolfa please let me know when the code is ready for review.

[rasoolfa]

hi @AnirudhDagar. sorry for late response, somehow I didn't see this msg. I thinks some of the conflicts caused when things are moved from old repository to this one. I'll clean up the PR and add new notebooks as well by next week. Will ping you next week

[astonzhang]

Closing this PR per offline discussions that new PRs will be posted on d2l-ai:vol2-rl branch