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

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• 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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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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