[docs] [issue13816] Two typos in the docs

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

The Chicago Manual of Style. which is perhaps the mostly widely used general style manual in the US, uses 'th' as a suffix without ' or -.
ie, 28th, etc except for 22d ('preferred' to 22nd) and 23d ('preferred' to 23rd).

https://en.wiktionary.org/wiki/nth
gives nth, which I use, with *n*th (italic n) as alternate form (when italic is available) and n'th and n-th as 'sometimes used'. I think both of the last two are ugly and that we should use either nth or, since we can, *n*th.  I see that we already have *i*.

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nosy: +terry.reedy

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<http://bugs.python.org/issue13816>
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