[Rd] weigths in nls (PR#13991)

[Stephen.Bond at cibc.com]

Potential bug:

I mistyped weights in the call ('weigths') and it did not produce any error=
 message. The coefs were exactly the same like without weights, so I was su=
spicious and when weights(nls1) gave NULL, I saw my typo.

Usually the function will say "Unused arguments", which shows you the error=
, but not nls.

Regards
Stephen

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