No docstring shown for `dict.update`

[debonte]

Environment data

• Language Server version: 2024.4.105
• OS and version: Windows 11
• Python version: 3.12.1

Code Snippet

{}.update()
{}.fromkeys()

Repro Steps

1. Hover over fromkeys. Note that a docstring is shown -- "Create a new dictionary with keys from iterable and values set to value."
2. Hover over update

Expected behavior

Docstring shown

Actual behavior

No docstring

Originally discussed at https://stackoverflow.com/questions/78193572/why-so-many-python-built-in-functions-has-no-in-code-docs/78193602#78193602. One user pointed to https://github.com/python/cpython/blob/8182319de33a9519a2f243ac8c35a20ef82a4d2d/Objects/dictobject.c#L4521-L4525 as the docstring for update.

[heejaechang]

Repro workspace for investigation:
https://github.com/heejaechang/pylance-repro/tree/main/pylance-issues/5831

[bschnurr]

This issue has been fixed in prerelease version 2026.2.102, which we've just released. You can find the changelog here: CHANGELOG.md