Minor update to help text

[Yegappan Lakshmanan]

Hi,

I am attaching a minor update to the help text to describe the filler lines

and a tag for the variable scope.

- Yegappan

[Bram Moolenaar]

Yegappan wrote:

> I am attaching a minor update to the help text to describe the filler lines
> and a tag for the variable scope.

That is useful, thanks.

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