Documentation issue for pipe method

[vitaly-t]

PR #132 created a problem for generating documentation.

@RebeccaStevens You changed pipe signature from function to const, and typedoc cannot pick it up correctly anymore, the pipe is altogether skipped from documentation, which in turn results in unresolved links.

You can check for errors by running npm run doc.

[vitaly-t]

Also, I noticed that for some methods, you copied inline documentation for sync + async. I'm not sure I see the benefit of it, duplicating documentation. Plus that extra category Async, in addition to already sufficient Async-Only.

I think it is simpler to keep just one documentation block per operator, and leave as Sync+Async category by default.

[vitaly-t]

This has been resolved, closing now.