Update types and add doc comments

[siddharthvp]

Update types and doc comments. Adapted from fork https://github.com/AnYiEE/types-mediawiki-renovate. The fork included many functions which incorrectly appeared in JSDuck docs but weren't actually accessible - I've removed them.

[AnYiEE]

Just a note.

the differences are as follows (5a0ccdb):

• Uri.d.ts - cat static method
• experiments.d.ts - hashString method

Thanks for your work.

In addition, I would like to ask how you will handle other methods that are marked as private but can actually be used?

[siddharthvp]

In addition, I would like to ask how you will handle other methods that are marked as private but can actually be used?

I suppose we could include them but mark as private either in JSDoc or using TypeScript's private modifier.