DOCS: Add missing space in SECURITY.md
Author: shivaheidari
Pull request: yes

# What does this PR do?

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Fixes # (issue)


## Before submitting
- [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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Comments:
Hi, fixing a small typo I found in the security doc

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_40087). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.