fix(challenges): typos in some basic node and express challenges

[gforce2k5]

fixed a typo in serve static assets challenge and in chain middleware to create a time server

ISSUES CLOSED: #113, #114

Description

Pre-Submission Checklist

• Your pull request targets the dev branch.
• Branch starts with either fix/, feature/, or translate/ (e.g. fix/challenge-tests)
• All new and existing tests pass the command npm test.
• Use npm run commit to generate a conventional commit message.
  Learn more here: https://conventionalcommits.org/#why-use-conventional-commits
• The changes were done locally on your machine and NOT GitHub web interface.
  If they were done on the web interface you have ensured that you are creating conventional commit messages.

Checklist:

• Tested changes locally.
• Addressed currently open issue (replace XXXXX with an issue no in next line)

Closes #113, #114

[scissorsneedfoodtoo]

Everything LGTM 👍

Thank you for this fix, @gforce2k5.

[mpmaan]

@scissorsneedfoodtoo #114 is still open.....is there any reason for that? When I hover over Closes, it shows that this PR only closes #113.
It seems that @gforce2k5 should have written "Closes #113, Closes #114".

[johnkennedy9147]

thanks @mpmaan - closed #114

[scissorsneedfoodtoo]

Thank you for reporting that @mpmaan. I'll keep my eye out for that in the future! And thank you for closing the issue @johnkennedy9147.