Update Dependabot alerts notification settings details

[mlkaufman14]

Copied text from this documentation: https://learn.microsoft.com/en-us/training/modules/configure-dependabot-security-updates-on-github-repo/3-dependabot-alerts

Why:

There is mixed information in the documentation on whether Dependabot alerts are enabled by default on public repositories or not. While studying for the GHAS certification I found conflicting documentation and practice exam questions. I verified myself by going into existing private and public repositories that did not have any GHAS settings modified yet and Dependabot alerts were disabled for both.

Documentation I read for studying:
https://learn.microsoft.com/en-us/training/modules/configure-dependabot-security-updates-on-github-repo/3-dependabot-alerts

Incorrect exam prep assessment question:

https://learn.microsoft.com/en-us/credentials/certifications/github-advanced-security/practice/results?assessmentId=590484996&practice-assessment-type=certification&snapshotId=50ffe989-45a4-419e-9321-311e572a5054

This practice exam site had the correct answer for the question:
https://ghcertified.com/questions/advanced_security/question-101/

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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Table of review links

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Source	Review	Production	What Changed
code-security/dependabot/dependabot-alerts/configuring-notifications-for-dependabot-alerts.md	fpt ghec ghes@ 3.19 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.19 3.18 3.17 3.16 3.15 3.14

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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