Run deno doc --lint on all exported files

[lucacasonato]

To ensure all files have sufficient documentation, we should run deno doc --lint. This will expose errors such as:

• missing JSDoc comments on exported symbols

  • Missing JSDoc comment.
        at file:///Users/lucacasonato/projects/github.com/denoland/deno_std/data_structures/binary_search_tree.ts:177:3
    

• symbols that are part of the public API, but not exposed

  • Type 'BinarySearchTree.prototype.rotateNode' references type 'Direction' which is not exported from a root module.`
    

• missing explicit typings on arguments / return types

  • Missing return type.
        at file:///Users/lucacasonato/projects/github.com/denoland/deno_std/data_structures/comparators.ts:5:1
    

[iuioiua]

Yep, for sure. It might also save a bit of time targeting any mod.ts files.

I think these points are best part of #3764 instead of a separate issue, as they refer to the same task.

[iuioiua]

I'm closing this in favor of #3878, which requires running deno doc—-lint on exported files.