Removed Ambiguity :workflow_dispatch statement about "default branch"

[lalithaar]

Changed the sentence according to SME recommendation.

Why:

Improves clarity on triggering the workflow

Closes: #35318

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 a 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.

[github-actions]

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Content directory changes

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Source	Preview	Production	What Changed
discussions/guides/best-practices-for-community-conversations-on-github.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
pull-requests/collaborating-with-pull-requests/addressing-merge-conflicts/resolving-a-merge-conflict-using-the-command-line.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10
actions/about-github-actions/understanding-github-actions.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	from reusable
actions/writing-workflows/about-workflows.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	from reusable
actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	from reusable
actions/security-for-github-actions/security-guides/using-githubs-security-features-to-secure-your-use-of-github-actions.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	from reusable
admin/managing-code-security/managing-github-advanced-security-for-your-enterprise/configuring-dependency-review-for-your-appliance.md	ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	from reusable
code-security/supply-chain-security/understanding-your-software-supply-chain/about-dependency-review.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	from reusable
pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/reviewing-dependency-changes-in-a-pull-request.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	from reusable

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

[lalithaar]

I am unsure of why it's showing already merged commits as I am new to contributions. I will look it up. But I hope the procedure is right. Please let me know if you have any feedbacks