docs: added a note to component's children section

[seasheepjoe]

Description

Please provide the following information:

• What changes you made:

Added a note to the component page in the docs on the children section.

• Why you made them, and:
  Clarification of the docs and wanting to inform users that the children prop is not iterable.

• Any other useful context:
  This PR is a necessary change and its comes from this issue : Children prop is broken on Angular #1580

Make sure to follow the PR preparation steps in CONTRIBUTING.md before submitting your PR:

• format the codebase: from the root, run yarn fmt:prettier.
• update all snapshots (in core & CLI): from the root, run yarn test:update
• add Changeset entry: from the root, run yarn g:changeset and follow the CLI instructions. Alternatively, use the Changeset Github Bot to create the file.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 2d13a9f

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[samijaber]

Thanks for the contribution @seasheepjoe 🙏🏽

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