Clarify the method of selecting several lines for commenting in PR.

[Denis-GH]

Why:

When I read this, I didn't understand where I needed to click to add a comment to multiple lines. So I suggest clarifying this.

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

Instead of just "click and drag" you should say where to click: "click on a line in the line number gutter area". In addition, there is another way to add a comment to several lines: "click on the blue comment icon and drag to select the range of lines".

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• [x] I have reviewed my changes in staging, available via the View deployment link in this PR's timeline (this link will be available after opening the PR).

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The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/commenting-on-a-pull-request.md	fpt ghec ghes@ 3.13 3.12 3.11 3.10 3.9	fpt ghec ghes@ 3.13 3.12 3.11 3.10 3.9
pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/reviewing-proposed-changes-in-a-pull-request.md	fpt ghec ghes@ 3.13 3.12 3.11 3.10 3.9	fpt ghec ghes@ 3.13 3.12 3.11 3.10 3.9

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

[nguyenalex836]

@Denis-GH Thanks so much for opening a PR! I'll get this triaged for review ✨

[Denis-GH]

@subatoi Thak you for reply! I have made the changes as per your suggestion. I have also added this to another doc about this.

[subatoi]

I'll go ahead and merge this shortly :)

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