fix: minor typos in warning messages

[govindpuff]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

N/A

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature (please, look at the "Scope of the project" section in the README.md file)
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe: typo fixes

What is the current behavior?

A couple of typos in warning messages in nodejs/repositories.bzl and nodejs/toolchain.bzl

Issue Number: N/A

What is the new behavior?

Aforementioned typos are fixed

Does this PR introduce a breaking change?

• Yes
• No

Other information