Clarify workflow approval steps across UI variants

[Tejasvp24]

Summary

• remove the instruction to return to the Conversation tab before approving workflows
• keep the step focused on the approval section so it matches both the older and newer UI paths

Closes #43521

[github-actions]

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Source	Review	Production	What Changed
actions/how-tos/manage-workflow-runs/approve-runs-from-forks.md	fpt ghec ghes@ 3.20 3.19 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.20 3.19 3.18 3.17 3.16 3.15 3.14	from reusable

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

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