[docs] [issue15580] fix True/False/None reST markup

[Zearin]

Zearin added the comment:

I agree that globally linking all occurrences of True/False/None is overkill. 

Perhaps linking the first occurrence per webpage would be a good standard?

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However, I *strongly* believe that:

1. The words be capitalized
2. The words should be marked up as ``True``, ``False``, or ``None``

Of course, these two items only apply when appropriate.  But after attempting this myself in #17074, I can say with certainty that this is the case *most of the time*.

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