Fix typo and update token call for "14_js-files-activity.md"

[dnly09]

Identified two items with the "14_js-files-activity.md" file:

• .github/actions/issue-makes/index.js to .github/actions/issue-maker/index.js
• github.GitHub(token) to github.getOctokit(token)

[github-learning-lab]

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[kn0rki]

hi,

did the lab for hours ago.
I wonder why here is the filename index.js but in the 2 other actions there is it main.js?
any reason for this?

Got and error message that the constructor github.GitHub not exist until i replaced it with github.getOctokit.
This is changed in 14_create-js-files.md but not in 14_js-files-activity.md.