Suggestion: show a try...catch...finally example

[mark-summerfield]

In http://docs.julialang.org/en/latest/manual/control-flow.html
it explains that try ... catch and try ... finally can be combined. I'm guessing that this means something like:

file = open("filename")
try
    # read file
catch err
   # report err
finally
    if file !== nothing
        close(file)
    end
end

But the whole point of a manual is that readers shouldn't have to guess:-)

Also, if there's a way to do this more nicely for files (like the open(f::Function... example shown earlier but built-in or in the std. lib.), it should be mentioned and linked to.