We need an empty line after ".. code-block: [...]", otherwise the first
lines are interpreted as arguments, not content. This makes the entire
code-blocks not render at all.
Fixes: 5d6d67a4d1 ("docs/android: improve documentation about building llvmpipe for Android")
Reviewed-by: Dylan Baker <None>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32831>