small edit on command line reference doc

I don't have edit access to this page, the command line reference: https://inkscape.org/en/doc/inkscape-man.html

But it needs a small edit. Near the bottom, the first sentence under GUI NOTES section:

Please change:

"To learn Inkscape's GUI operation, read the tutorials in Help > Tutorials."

To:

"To learn Inkscape's GUI operation, read the manual in Help > Inkscape manual, and the tutorials in Help > Tutorials."

Thanks!

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