Operator overload signatures are not shown in docs app

[cartant]

Description Of The Issue

In the docs app, overload signatures are shown for methods on Observable - e.g. five overload signatures are shown for subscribe.

However, overload signatures are not shown for operators. That makes documenting shareReplay somewhat difficult, as it has a number of signatures - including a signature that takes a single config object. The same problem exists for the config object signature added for retry in this PR.

It's not clear what needs to be done to effect the showing of overload signatures for operators and I'm not sure what it is that effects them for Observable#subscribe - as there doesn't seem to be anything specific to overloads in the TSDoc.

[dzhavat]

It might sound funny but I just added a 3rd signature function to the shareReplay operator, rebuild the docs, launched them, and now the Overloads section is there.

I did the opposite with the mergeMap operator. Deleted a signature function to just two (from three) and the Overloads section is not there.

So there's something with having a minimum number of signatures before they appear in the docs. 🤔

[cartant]

@dzhavat Nice find.

[dzhavat]

Looks like my observation above is correct. Here's how the Overloads section is build :)

rxjs/docs_app/tools/transforms/templates/api/function.template.html

Line 19 in 5170728

{% if doc.overloads.length >= 3 %}

[jakovljevic-mladen]

Closed in #7367.