Update youtube embed on UX iteration page
Why is this change being made?
This mr fixes broken youtube embed on the iteration section of the UX handbook.
The embed needs to follow the pattern recommended here https://about.gitlab.com/handbook/markdown-guide/#display-videos-from-youtube
Current behaviour
Author Checklist
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Provided a concise title for the MR -
Added a description to this MR explaining the reasons for the proposed change, per [say-why-not-just-what][transparency] -
Assign this change to the correct DRI - If the DRI for the page/s being updated isn’t immediately clear, then assign it to your manager.
- If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in [#mr-buddies][mr-buddies-slack].
- If the changes relate to any part of the project other than updates to content and/or data files please make sure to ping
@gl-static-site-editorin a comment for a review and merge. For example changes to.gitlab-ci.yml, JavaScript/CSS/Ruby code or the layout files.