Sweave homepage does not exist anymore (remove URL?)

Dear LyX docs,

In our Sweave example, we reference the previous homepage of Sweave:

http://www.stat.uni-muenchen.de/~leisch/Sweave/

Sweave does not have a homepage. For one, it is now in base R. Second,
it is not as commonly used as it used to be, since many users have
transitioned to knitr.

I propose to change

    The homepage of Sweave is at
    http://www.stat.uni-muenchen.de/~leisch/Sweave/

to

    The Sweave user manual is at
    https://stat.ethz.ch/R-manual/R-devel/library/utils/doc/Sweave.pdf

Any objection?

Scott

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