[Rd] adding examples of stop and break to function.Rd and Control.Rd

[Timothy Bates]

function.Rd currently has no example of "stop", Similarly in Control.Rd, there 
is currently no example of break: these might be helpful for users.

function.Rd suggestion:
# Often it is useful to be able to exit a function on some condition: Use 
"stop" to do this
testJunk <- function(junk) {
        if( is.null(junk)) {
                stop("Junk must not be null!")
        }       
}
junk=NULL
testJunk(junk)



Control.Rd suggestion:

# Example using break: prints n unless n^2 exceeds 9: in which case it exits 
the loop.

for(n in 1:5) {
   if(n^2>9){
        break
   } else {
        cat(n,"\n")
   }
}

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