[w3c/manifest] Pull request template: Split normative options. (#749)

PRs can distinguish between adding normative requirements versus recommendations/optional.

This change (choose one):

* [ ] Breaks existing normative behavior (please add label "breaking")
* [ ] Adds new normative behavior
* [ ] Makes only editorial changes (only changes informative sections, or
  changes normative sections without changing behavior)
* [X] Is a "chore" (metadata, formatting, fixing warnings, etc).
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/749

-- Commit Summary --

  * Pull request template: Split normative options.

-- File Changes --

    M PULL_REQUEST_TEMPLATE.md (3)

-- Patch Links --

https://github.com/w3c/manifest/pull/749.patch
https://github.com/w3c/manifest/pull/749.diff

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