minor #929 Added warning for list of embedded components (florentdestremau)

This PR was squashed before being merged into the 2.x branch.

Discussion
----------

Added warning for list of embedded components

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Tickets       |  <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->
| License       | MIT

As discussed on slack with `@weaverryan` , I think the `key` trick for lists of embedded components is an easy footgun and thus should be pointed as soon as the docs introduce the subject. I'm open for better wording or placement.

Commits
-------

c99153a Added warning for list of embedded components

Author: weaverryan

src/LiveComponent/doc/index.rst

@@ -2354,8 +2354,9 @@ cause the child to re-render (but it *can* - keep reading). Or, if
 a model in a child updates, it won't also update that model in its parent
 (but it *can* - keep reading).
 
-The parent-child system is *smart*. And with a few tricks, you can make
-it behave exactly like you need.
+The parent-child system is *smart*. And with a few tricks
+(:ref:`such as the key prop for lists of embedded components <rendering-quirks-with-list-of-embedded-components>`),
+you can make it behave exactly like you need.
 
 .. _child-component-independent-rerender: