[Contributing] Minor updates in the Docs contributing guide #21440
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The intro of this "Contrbuting Docs" page is a bit odd with that
Sphinx
section title:This is something from the past, when we used the Sphinx project, but we can now get rid of it.
Also, I propose to reword the rules a bit to make them more actionable ("do this", "don't do this", etc.) Finally, I propose to update the rule about the line length because we use the 80-character limit as the actual limit instead of 72-78.