Fix failing doctests

[xorJane]

I made minor changes to expected outputs for doctests, like updating line numbers. Now all doctests pass. Thank you!

[tkelman]

For future reference, there's a bit of a shortcut for fixing these. Do

make docs # be sure your julia build is up-to-date
cd doc/deps/v0.7/Documenter
git show origin/fix-doctests | git apply
cd ../../..
make doctest # this will auto-update the expected output to match the actual
make clean # get rid of modifications to documenter
make -C .. # rebuild julia to update compiled docstring info
make doctest # should hopefully pass

and check that the resulting git diff looks sane (this procedure would have done something slightly insane on metaprogramming.md here, probably because the previous output was empty). x-ref JuliaDocs/Documenter.jl#448, hopefully this can be made a proper feature in Documenter that we could add a makefile target for so it would just be make -C doc fix-doctests or something like that.