#2511 add codebytes for javascript promise race and reject

[carlos-ds]

Description

Added Codebyte examples for Promise.reject and Promise.race

Closes #2511

Type of Change

Updating the documentation

Checklist

• All writings are my own.
• My entry follows the Codecademy Docs style guide.
• My changes generate no new warnings.
• I have performed a self-review of my own writing and code.
• I have checked my entry and corrected any misspellings.
• I have made corresponding changes to the documentation if needed.
• I have confirmed my changes are not being pushed from my forked main branch.
• I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• Under "Development" on the right, I have linked any issues that are relevant to this PR (write "Closes # in the "Description" above).

[SSwiniarski]

@carlos-ds This looks good as-is. Passing it on to a second review.

[KTom101]

@carlos-ds I added some changes to the original content. Looks good, otherwise.

[github-actions]

👋 @carlos-ds
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