fix: remove duplicate line about actions

[bo0tzz]

Why:

Closes: #37638

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

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• 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.

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Pull Request Overview

This PR removes a duplicate bullet line regarding actions enablement in the setup instructions for code scanning.

• Removed the redundant line about actions enablement and retained a single, conditional bullet for supported languages.

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Source	Review	Production	What Changed
code-security/code-scanning/enabling-code-scanning/configuring-default-setup-for-code-scanning-at-scale.md	fpt ghec ghes@ 3.16 3.15 3.14 3.13 3.12	fpt ghec ghes@ 3.16 3.15 3.14 3.13 3.12

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

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[Sharra-writes]

Thanks for opening a PR to fix this! 🎉 I'll get it triaged for review.