[w3c/manifest] Deleted repeated "safe" and fixed typo in definition of "safe zone" (#720)

Closes #???

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).

The following tasks have been completed:

* [ ] Confirmed there are no new ReSpec errors/warnings.

Commit message:

Deleted repeated "safe" word and fixed typo in definition of "safe zone".

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/720

-- Commit Summary --

  * Deleted repeated "safe" and fixed typo in definition of "safe zone"

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/manifest/pull/720.patch
https://github.com/w3c/manifest/pull/720.diff

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