[Rd] documentation for diff (PR#1185)

[maechler@stat.math.ethz.ch]

>>>>> "PaulG" == Paul Gilbert <pgilbert@bank-banque-canada.ca> writes:

    PaulG> The documentation for diff says: If `x' is a vector
    PaulG> of length `n' and `differences=1', then the computed
    PaulG> result is equal to the successive differences
    PaulG> `x[(1:n-lag)] - x[(lag:n)]'. ...

    PaulG> This last line should say:

    PaulG>      `x[(1+lag):n] - x[1:(n-lag)]'.

Of course!
Thank you Paul; fix now committed.

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