[w3c/manifest] Added security consideration advice for out-of-scope UI spoofing. (#748)

Closes #747.

This change (choose one):

* [ ] Breaks existing normative behavior (please add label "breaking")
* [ ] Adds new normative behavior
* [X] Makes only editorial changes (only changes informative sections, or
  changes normative sections without changing behavior)
* [ ] Is a "chore" (metadata, formatting, fixing warnings, etc).

Commit message:

Added security consideration advice for out-of-scope UI spoofing.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/748

-- Commit Summary --

  * Added security consideration advice for out-of-scope UI spoofing.

-- File Changes --

    M index.html (13)

-- Patch Links --

https://github.com/w3c/manifest/pull/748.patch
https://github.com/w3c/manifest/pull/748.diff

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