Fix typo in the number of properties

[azaralampanah2]

What does this change?

it amends the sentence that was written incorrectly.

it amends the sentence: "there are 3 properties" to "there are 4 properties" .
Path to the file: curriculum/common-content/en/module/js2/key-values/index.md

Common Content?

Yes

• Block/s

Common Theme?

• Yes

Issue number: #issue-number

Org Content?

Module | Sprint | Page Type | Block Type

Checklist

• I have read the contributing guidelines
• I have checked my spelling and grammar with an automated tool
• I have previewed my changes to check the markdown renders as I intend
• I have run my code to check it works
• My changes follow our Style Guide

Who needs to know about this?

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[illicitonion]

Perfect, thanks so much for fixing this!

One note about PRs in general - I see you made this change on the main branch of your fork:

In general I'd recommend never committing any changes to a main branch - instead to make a new branch for the change you're making, and make the PR from that.

The main reason for this is that you generally want to keep main in sync with who you forked from. That's harder if you have your own local changes to it. The model we tend to use is: Make a branch, PR from the branch, merge to main on GitHub, pull in those changes to your local main.