maint: remove note that no-volume needs root

[matthew-clark33]

Why:

Docs are misleading for github ARC regarding kubernetes novolume mode needing root. it is not required
Closes: #44324

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

Removing note that says kubernetes no volume mode needs root to run

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.

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[matthew-clark33]

@nikola-jokic

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Table of review links

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The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
actions/how-tos/manage-runners/use-actions-runner-controller/deploy-runner-scale-sets.md	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17 3.16	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17 3.16

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

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[Sharra-writes]

We already have a PR to do this, as noted in the issue.