[Rd] trivial typos in man/switch.Rd

[Ben Bolker]

  My colleague points out that these typos are probably still present
because almost no-one has the stamina to read that far down in ?switch ...

  cheers
    Ben Bolker

-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: switch_patch.txt
URL: <https://stat.ethz.ch/pipermail/r-devel/attachments/20190703/8fce1dbc/attachment.txt>