[w3c/uievents] Add reference to XML to back the white space production (#146)

Made reference informative since it appears in a section marked informative
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/uievents/pull/146

-- Commit Summary --

  * Add reference to XML to back the white space production

-- File Changes --

    M sections/legacy-event-initializers.txt (4)

-- Patch Links --

https://github.com/w3c/uievents/pull/146.patch
https://github.com/w3c/uievents/pull/146.diff

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