Update CONTRIBUTING.md

Coming from chat with Carlos, adding 
> It is required to complete every step and check every box in the PR Author Checklist. If a box has been checked without the action being taken, it will be a violation of Rule #2 and could lead to a warning  being issued.

contributingGuides/CONTRIBUTING.md

@@ -124,7 +124,7 @@ Additionally, if you want to discuss an idea with the open source community with
     [gpg]
         program = gpg
     ```
-11. [Open a pull request](https://docs.github.com/en/free-pro-team@latest/github/collaborating-with-issues-and-pull-requests/creating-a-pull-request-from-a-fork), and make sure to fill in the required fields.
+11. [Open a pull request](https://docs.github.com/en/free-pro-team@latest/github/collaborating-with-issues-and-pull-requests/creating-a-pull-request-from-a-fork). It is required to complete every step and check every box in the PR Author Checklist. If a box has been checked without the action being taken, it will be a violation of [Rule #2](https://github.com/Expensify/App/blob/main/CODE_OF_CONDUCT.md) and could lead to [a warning](https://github.com/Expensify/App/blob/main/CODE_OF_CONDUCT.md#compliance)  being issued.
 12. An Expensify engineer and a member from the Contributor-Plus team will be assigned to your pull request automatically to review.
 13. Daily updates on weekdays are highly recommended. If you know you won’t be able to provide updates within 48 hours, please comment on the PR or issue stating how long you plan to be out so that we may plan accordingly. We understand everyone needs a little vacation here and there. Any issue that doesn't receive an update for 5 days (including weekend days) may be considered abandoned and the original contract terminated.