[Rd] Patch to replace "his" in Writing R Extensions

[Maëlle SALMON]

Dear R-devel team,

Many thanks for the great resource that is "Writing R Extensions"! 

I noticed two occurrences of "his", one to refer to the R package user, another to refer to the R package author. Folks in these two groups are not all men, so I suggest changing the word to "their" to make it gender-neutral. Attached is a patch for your consideration. 

Thanks for your time, best regards, 

Maëlle.
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