Update CONTRIBUTION_LADDER.md

[geetachavan1]

Fixing typo

What does this change

Give a summary of the change, and how it affects end-users. It's okay to copy/paste your commit messages.

For example if it introduces a new command or modifies a commands output, give an example of you running the command and showing real output here.

What issue does it fix

Closes # (issue)

If there is not an existing issue, please make sure we have context on why this change is needed. See our Contributing Guide for examples of when an existing issue isn't necessary.

Notes for the reviewer

Put any questions or notes for the reviewer here.

Checklist

• Did you write tests?
• Did you write documentation?
• Did you change porter.yaml or a storage document record? Update the corresponding schema file.
• If this is your first pull request, please add your name to the bottom of our Contributors list. Thank you for making Porter better! 🙇‍♀️