Fix intro text formatting in approval documentation

[akshatsinghai6682-sketch]

Why:

Improved the intro sentence wording for better readability and clarity.

Closes: N/A

What's being changed:

• Removed unnecessary words from the intro sentence
• Improved sentence readability in the workflow approval documentation

Check off the following:

• The changes in this PR meet the docs fundamentals
• 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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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-workflow-runs/approve-runs-from-forks.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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