fix containerdoccomment not handled in docgen.zig
fix containerdoccomment not handled in docgen.zig

andrewrk/zig,raulgrell/zig,andrewrk/zig,zig-lang/zig,raulgrell/zig,raulgrell/zig,raulgrell/zig,zig-lang/zig,zig-lang/zig,raulgrell/zig