[docs] [issue13816] Two typos in the docs

[Stefan Krah]

Stefan Krah <stefan-usenet at bytereef.org> added the comment:

> ... with *n*th (italic n) as alternate form

Knuth uses that in TAOCP, too. I think with or without italics it's
the most frequently used form overall.

Also the Lisp function is called nth and not n-th, even though in Lisp
it is possible to use hyphens in function names.

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