[PATCH 00/02] Improvements to jit documentation

[David Malcolm]

Various improvements to jit documentation

Touches one of the tutorial examples, which is also used as part of the
testsuite: successfully bootstrapped & regrtested on
x86_64-unknown-linux-gnu (Fedora 20).

OK for trunk?
(am not yet officially blessed as the JIT maintainer, so I require
review for the non-obvious patches)

I'd regenerate the autogenerated libgccjit.texinfo when committing.