Update CONTRIBUTING.md
Author: shreem-123
Pull request: yes

adverb missing

# What does this PR do?

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Fixes # (issue)


## Before submitting
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Comments:
Thanks for the PR! In this case, adding *that* doesn't make it an adverb, and I don't think it's necessary to use it as a determiner since we're talking about the bug in a general and generic sense.