fix: clarify dependabot enable and disable funtion

[riteshsp2000]

Why:

Closes #15609

What's being changed:

• rephrase the 4th point under "Enabling or disabling Dependabot security updates for an individual repository" clarifying the behaviour of enable and disable buttons

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Source	Preview	Production	What Changed
content/code-security/supply-chain-security/managing-vulnerabilities-in-your-projects-dependencies/configuring-dependabot-security-updates.md	Modified	Original

[ramyaparimi]

@riteshsp2000
Thanks so much for opening a PR! I'll get this triaged for review ⚡

[felicitymay]

Thanks for applying my suggestion. This PR is a great demonstration that two heads are better than one, as we have both identified different ways that the original content was confusing. 💖

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