docgen: make the name required in the Code node

Update the genToc funtion to make the name required in the Code node,
and add an additional optional field for the expected error, to use with
test_err, test_safety and obj_err.

Update langref.html.in to ensure all code blocks have a name that

  - is unique, so that a doctest can be identified by it
  - is descriptive

For test, test_err and test_safefy, ensure that the doctest name starts
with "test_", excluding doctests in the "Zig Test" section and doctests
that are imported by other doctests.

Ensure that the indentation of code_begin and code_end blocks are
consistent.

Fix a typo in pointer_arthemtic.

0 files changed, 0 insertions, 0 deletions