docs: explain a workaround for if with typed children

[ctron]

Description

Explains a workaround for #3256

Checklist

• I have reviewed my own code

[github-actions]

Visit the preview URL for this PR (updated for commit 23debb4):

https://yew-rs--pr3560-feature-doc-if-type-hu7h7tdk.web.app

_{(expires Wed, 20 Dec 2023 09:24:09 GMT)}

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[ctron]

Is there something missing for this PR? It's a doc only change and should be quick to merge.

[futursolo]

Thank you for your pull request.

However, I do not think this pull request will be accepted due to the issue with typed children and ChildrenRenderer itself, which is discussed in detail in #3256 and #3262.
As a result, we have committed to remove Children* from most examples and no longer recommend their usage.

You can try out a slightly modified version of the code you submitted in:
https://play.yew.rs/?shared=j98egT98b67VRJAGJIJu

2023-12-19.18.32.11.mov

The correct behaviour should be the input containing 3 being removed and added, however, input 1 is being toggled instead.

[ctron]

So, what's the strategy on having type safe children in the future?