Autodoc: public functions and fields inside test blocks leak into docs

[sbancuz]

Zig Version

0.12.0

Steps to Reproduce and Observed Behavior

If you look at std.meta there are a lot of fn a() and fn foo() that probably shouldn't be there.

Expected Behavior

There should be only relevant functions.

[AndrewKraevskii]

Problem is in public functions (and fields) leaking from test blocks but it is impossible to access them. So solution can be to ignore test block when searching for functions to show in docs.