For me, I browse through the GitHub UI and I also keep local copies of Zig (for various releases) so I can `git grep` and glance through lib/std/mem.zig or lib/std/array_list.zig or (as in this post) lib/std/json/static.zig.
I'm not saying it works for everyone but frankly, like motiejus it sounds, I don't mind the minor challenge of being forced to read source code.
Zig taught me to read stdlib source, which I do at my $dayjob now too.
It is perfectly fine to read stdlib source. Start with lib/std/mem.zig after reading the docs about the language.
It is much more readable than the C "docs" ISO/IEC 9899:2011. I am so productive now. :)